The use of head-mounted displays (HMD) for virtual reality (VR) application-based purposes including therapy, rehabilitation, and training is increasing. Despite advancements in VR technologies, many users still experience sickness symptoms. VR sickness may be influenced by technological differences within HMDs such as resolution and refresh rate, however, VR content also plays a significant role. The primary objective of this systematic review and meta-analysis was to examine the literature on HMDs that report Simulator Sickness Questionnaire (SSQ) scores to determine (...) the impact of content. User factors associated with VR sickness were also examined. A systematic search was conducted according to PRISMA guidelines. Fifty-five articles met inclusion criteria, representing 3,016 participants (mean age range 19.5-80; 41% female). Findings show gaming content recorded the highest total SSQ mean 34.26 (95%CI 29.57-38.95). VR sickness profiles were also influenced by visual stimulation, locomotion and exposure times. Older samples (mean age ≥35 years) scored significantly lower total SSQ means than younger samples, however, these findings are based on a small evidence base as a limited number of studies included older users. No sex differences were found. Across all types of content, the pooled total SSQ mean was relatively high 28.00 (95%CI 24.66-31.35) compared with recommended SSQ cut-off scores. These findings are of relevance for informing future research and the application of VR in different contexts. (shrink)

Immersive virtual reality (VR) emerges as a promising research and clinical tool. However, several studies suggest that VR induced adverse symptoms and effects (VRISE) may undermine the health and safety standards, and the reliability of the scientific results. In the current literature review, the technical reasons for the adverse symptomatology are investigated to provide suggestions and technological knowledge for the implementation of VR head-mounted display (HMD) systems in cognitive neuroscience. The technological systematic literature indicated features pertinent to (...) display, sound, motion tracking, navigation, ergonomic interactions, user experience, and computer’s hardware that should be considered by the researchers. Subsequently, a meta-analysis of 44 neuroscientific or neuropsychological studies involving VR HMD systems was performed. The meta-analysis of the VR studies demonstrated that the new generation HMDs induced significantly fewer dropouts and VRISE. Importantly, the commercial versions of the new generation HMDs with ergonomic interactions had zero incidents of adverse symptomatology and dropouts. Solely, HMDs equivalent to or greater than the commercial versions of contemporary HMDs accompanied with ergonomic interactions are suitable for implementation in cognitive neuroscience. In conclusion, researchers’ technological competency, along with meticulous methods and reports pertinent to software, hardware, and VRISE, are paramount to ensure the health and safety standards and the reliability of neuroscientific results. (shrink)

Driving simulators are becoming increasingly common in driver training and assessment. Since virtual reality is generally regarded as an appropriate environment for measuring risk behavior, simulators are also used to assess hazard perception, which is considered to be one of the most important skills for safe driving. Simulators, which offer challenges that are indeed comparable to driving in real traffic, but at a very low risk of physical injury, have the potential to complement theoretical and practical driver trainings and tests. (...) Although configurations and fidelity differ considerably between driving simulators, studies comparing the impact of their distinct features on driving performance and test validity remain rare. In this context, prior research demonstrated that a wider field of view led to earlier speed adjustments in response to potential hazards—especially for experienced drivers. The wider field of view was assumed to cause the drivers to be more present in the virtual world, which in turn provoked more natural scanning of the road and therefore, earlier hazard detection in experienced drivers. Research on spatial presence in other contexts support this assumption. The present experiment investigated whether this effect could be enhanced by an even more immersive presentation technique for driving simulation: a head-mounted display. Moreover, we studied the interplay between display mode, sense of presence and simulation sickness. Eighty experienced and less experienced drivers completed six simulation-based hazard perception scenarios, which were displayed either via a triple-monitor set-up or an HMD. Results indicate that the experienced drivers showed very similar driving and risk behavior as the inexperienced drivers in both experimental conditions. However, there were significant differences between the two display conditions. The use of an HMD resulted in a clearer and more abrupt speed reduction, more virtual presence, and a higher degree of simulation sickness. However, the interrelation between these three variables could not be conclusively clarified in the present study and thus represents a research aim that could be addressed in future studies. (shrink)

Multimedia learning theories suggest presenting associated pieces of information in spatial and temporal contiguity. New technologies like Augmented Reality allow for realizing these principles in science laboratory courses by presenting virtual real-time information during hands-on experimentation. Spatial integration can be achieved by pinning virtual representations of measurement data to corresponding real components. In the present study, an Augmented Reality-based presentation format was realized via a head-mounted display and contrasted to a separate display, which provided a well-arranged (...) data matrix in spatial distance to the real components and was therefore expected to result in a spatial split-attention effect. Two groups of engineering students performed six experiments exploring fundamental laws of electric circuits. Cognitive load and conceptual knowledge acquisition were assessed as main outcome variables. In contrast to our hypotheses and previous findings, the Augmented Reality group did not report lower extraneous load and the separate display group showed higher learning gains. The pre- and posttest assessing conceptual knowledge were monitored by eye tracking. Results indicate that the condition affected the visual relevancy of circuit diagrams to final problem completion. The unexpected reverse effects could be traced back to emphasizing coherence formation processes regarding multiple measurements. (shrink)

While numerous studies show that brain signals contain information about an individual’s current state that are potentially valuable for smoothing man-machine interfaces, this has not yet lead to the use of brain computer interfaces (BCI) in daily life. One of the main challenges is the common requirement of personal data that is correctly labelled concerning the state of interest in order to train a model, where this trained model is not guaranteed to generalize across time and context. Another challenge is (...) the requirement to wear electrodes on the head. We here propose a BCI that can tackle these issues and may be a promising case for BCI research and application in everyday life. The BCI uses EEG signals to predict head rotation in order to improve images presented in a Virtual Reality (VR) headset. When presenting a 360° video to a headset, Field-of-View approaches only stream the content that is in the current field of view and leave out the rest. When the user rotates the head, other content parts need to be made available soon enough to go unnoticed by the user which is problematic given the available bandwidth. By predicting head rotation, the content parts adjacent to the currently viewed part could be retrieved in time for display when the rotation actually takes place. Eleven participants generated left- and rightward head rotations while head movements were recorded using the headsets motion sensing system and EEG sensors. We trained neural network models to distinguish EEG epochs preceding rightward, leftward and no rotation. Applying these models to streaming EEG data that was withheld from the training showed that 400 ms before rotation onset, the probability ‘no rotation’ started to decrease and the probabilities of an upcoming right- or leftward rotation started to diverge in the correct direction. In the proposed BCI scenario, users already wear a device on their head allowing for integrated sensors. Moreover, it is possible to acquire accurately labeled training data on the fly, and continuously monitor and improve the model’s performance. The BCI can be harnessed if it will improve imagery and therewith enhance immersive experience. (shrink)

BackgroundAttention deficit hyperactivity disorder is clinically diagnosed; however, quantitative analysis to statistically analyze the symptom severity of children with ADHD via the measurement of head movement is still in progress. Studies focusing on the cues that may influence the attention of children with ADHD in classroom settings, where children spend a considerable amount of time, are relatively scarce. Virtual reality allows real-life simulation of classroom environments and thus provides an opportunity to test a range of theories in a naturalistic (...) and controlled manner. The objective of this study was to investigate the correlation between participants’ head movements and their reports of inattention and hyperactivity, and to investigate how their head movements are affected by different social cues of different sensory modalities.MethodsThirty-seven children and adolescents with and without ADHD were recruited for this study. All participants were assessed for diagnoses, clinical symptoms, and self-reported symptoms. A virtual reality-continuous performance test was conducted under four conditions: control, no-cue, visual cue, and visual/audio cue. A quantitativecomparison of the participants’ head movements was conducted in three dimensions using a head-mounted display in a VR classroom environment. Task-irrelevant head movements were analyzed separately, considering the dimension of movement needed to perform the VR-CPT.ResultsThe magnitude of head movement, especially task-irrelevant head movement, significantly correlated with the current standard of clinical assessment in the ADHD group. Regarding the four conditions, head movement showed changes according to the complexity of social cues in both the ADHD and healthy control groups.ConclusionChildren and adolescents with ADHD showed decreasing task-irrelevant movements in the presence of social stimuli toward the intended orientation. As a proof-of-concept study, this study preliminarily identifies the potential of VR as a tool to understand and investigate the classroom behavior of children with ADHD in a controlled, systematic manner. (shrink)

Virtual reality (VR) through a head-mounted display (HMD) can provide new experiences. However, it remains unclear how the characteristics of HMDs affect users’ memory. To use HMDs more effectively and appropriately in several applied fields, including education, it is necessary to clarify what characteristics of HMDs affect users’ memory. A head-tracking function mounted on an HMD helps to detect the user’s head direction to enable a simulation experience akin to the real world. When we (...) experience a simulation on an HMD, we actively perceive the visual world. In this study, we assessed how active/passive viewing affects users’ memory of VR content. We conducted a psychological experiment in which participants watched a movie on an HMD. In the active viewing condition, the presented view changed depending on the participant’s head direction. In the passive viewing condition, the presented view was a recorded movie that was shown to the participants in the active viewing condition. All participants took a memory test about the content presented in the movie on the day of viewing and two weeks later. The results showed that performance on the memory test in the active viewing condition was significantly lower than that in the passive viewing condition after two weeks. This result indicated that active viewing in VR inhibited users’ memory compared to passive viewing. The current study contributes to the development of new VR techniques, such as educational learning. (shrink)

: Research done in recent years shows that Virtual Reality can be an effective tool for distracting attention from pain. The purpose of this study was to test how the complexity of Virtual Environment influences the experienced intensity of thermal pain stimuli. A within-subjects design experiment was conducted, using cold pressor test for pain stimulation. Research was done on 31 students of Wroclaw Universities. Participants played games created for the purpose of the study, using head mounted displays and (...) movement sensors. Two Virtual Environments differing in the level of complexity and non-VR control condition were used. The order of all conditions was counterbalanced. Participants reported significantly lower pain intensity after playing the high complexity game, compared to the low complexity game. There were also significant differences between non-VR control condition and high complexity game, but not between non-VR and low complexity game. The pain tolerance was significantly higher in both VR conditions comparing to non-VR conditions. However, no significant differences between VE’s were found in pain tolerance ratings. Results of this study provide preliminary evidence that game complexity can be related to pain experience during VR interventions. (shrink)

In this paper we introduce a paradigm of experiment which, we believe, is of interest both in psychology and philosophy. There the subject wears an HMD (head-mount display), and a camera is set up at the upper corner of the room, in which the subject is. As a result, the subject observes his own body through the HMD. We will mainly focus on the philosophical relevance of this experiment, especially to the thesis of so-called 'immunity to error through (...) misidentification relative to the first-person pronoun'. We will argue that one experiment conducted in this setting, which we call the bodily illusion experiment, provides a counterexample to that thesis. (shrink)

Immersive 360-degree video has become a new learning resource because of its immersive sensory experience. This study examined the effects of textual and visual cues on learning and attention in immersive 360-degree video by using eye-tracking equipment integrated in a virtual reality head-mounted display. Participants were randomly assigned to one of four conditions: no cues, textual cues in the initial field of view, textual cues outside the initial FOV, and textual cues outside the initial FOV + visual (...) cues. The results showed that the cues helped learners achieve better learning outcomes and spend more time focusing on the areas with cues. In addition, the study found a serious imbalance in the distribution of learners’ attention in each region of the video. The attention directed to textual cues in the initial FOV is much higher than the attention directed to textual cues outside the initial FOV. Adding visual cues can effectively direct attention to textual cues outside the initial FOV and alleviate the imbalance of attention distribution. Consequently, adding cues to immersive 360-degree video can be an appropriate approach to promote learning and guide attention in immersive 360-degree video learning environments. This study provided new insights into the design and development of immersive 360-degree video instructional resources. (shrink)

Movement abnormalities are prevalent across all stages of schizophrenia contributing to poor social functioning and reduced quality of life. To date, treatments are scarce, often involving pharmacological agents, but none have been shown to improve movement abnormalities effectively. Virtual reality (VR) is a tool used to simulate virtual environments where behavioral performance can be quantified safely across different tasks while exerting control over stimulus delivery, feedback and measurement in real time. Sensory information is transmittedviaa head mounted display (...) allowing users to directly interact with virtual objects and bodies using gestures and body movements in the real world to perform different actions, permitting a sense of immersion in the simulated virtual environment. Although, VR has been widely used for successful motor rehabilitation in a variety of different neurological domains, none have been exploited for motor rehabilitation in schizophrenia. The objectives of this article are to review movement abnormalities specific to schizophrenia, and how VR can be utilized to restore and improve motor functioning in patients with schizophrenia. Constructing VR-mediated motor-cognitive interventions that can help in retaining and transferring the learned outcomes to real life are also discussed. (shrink)

African literature has played a major role in changing and shaping perceptions about African people and their way of life for the longest time. Unlike western cultures that are associated with advanced forms of writing, African literature is oral in nature, meaning it has to be recited and even performed. Although Africa has an old tribal culture, African philosophy is a new and strange idea among us. Although the problem of “universality” of African philosophy actually refers to the question of (...) whether Africa has heckling of philosophy in the Western sense, obviously, the philosophy bred by Africa’s native culture must be acknowledged. Therefore, the human–computer interaction-oriented method is proposed to appreciate African literature and African philosophy. To begin with, a physical object of tablet-aid is designed, and a depth camera is used to track the user’s hand and tablet-aid and then map them to the virtual scene, respectively. Then, a tactile redirection method is proposed to meet the user’s requirement of tactile consistency in head-mounted display virtual reality environment. Finally, electroencephalogram emotion recognition, based on multiscale convolution kernel convolutional neural networks, is proposed to appreciate the reflection of African philosophy in African literature. The experimental results show that the proposed method has a strong immersion and a good interactive experience in navigation, selection, and manipulation. The proposed HCI method is not only easy to use, but also improves the interaction efficiency and accuracy during appreciation. In addition, the simulation of EEG emotion recognition reveals that the accuracy of emotion classification in 33-channel is 90.63%, almost close to the accuracy of the whole channel, and the proposed algorithm outperforms three baselines with respect to classification accuracy. (shrink)

Atypical sensorimotor developmental trajectories greatly contribute to the profound heterogeneity that characterizes Autism Spectrum Disorders. Individuals with ASD manifest deviations in sensorimotor processing with early markers in the use of sensory information coming from both the external world and the body, as well as motor difficulties. The cascading effect of these impairments on the later development of higher-order abilities underlines the need for interventions that focus on the remediation of sensorimotor integration skills. One of the promising technologies for such stimulation (...) is Immersive Virtual Reality. In particular, head-mounted displays have unique features that fully immerse the user in virtual realities which disintegrate and otherwise manipulate multimodal information. The contribution of each individual sensory input and of multisensory integration to perception and motion can be evaluated and addressed according to a user’s clinical needs. HMDs can therefore be used to create virtual environments aimed at improving people’s sensorimotor functioning, with strong potential for individualization for users. Here we provide a narrative review of the sensorimotor atypicalities evidenced by children and adults with ASD, alongside some specific relevant features of IVR technology. We discuss how individuals with ASD may interact differently with IVR versus real environments on the basis of their specific atypical sensorimotor profiles and describe the unique potential of HMD-delivered immersive virtual environments to this end. (shrink)

We investigate two issues about the subjective experience of one's body: first, is the experience of owning a full-body fundamentally different from the experience of owning a body-part?Second, when I experience a bodily sensation, does it guarantee that I cannot be wrong about whether it is me who feels it? To address these issues, we conducted a series of experiments that combined the rubber hand illusion (RHI) and the “body swap illusion.” The subject wore a head mounted (...) class='Hi'>display (HMD) connected with a stereo camera set on the experimenter's head. Sitting face to face, they used their right hand holding a paintbrush to brush each other's left hand. Through the HMD, the subject adopted the experimenter's first-person perspective (1PP) as if it was his/her own 1PP: the subject watched either the experimenter's hand from the adopted 1PP, and/or the subject's own hand from the adopted third-person perspective (3PP) in the opposite direction (180°), or the subject's full body from the adopted 3PP (180°, with or without face). The synchronous full-body conditions generate a “self-touching illusion”: many participants felt that “I was brushing my own hand!” We found that (1) the sense of body-part ownership and the sense of full-body ownership are not fundamentally different from each other; and (2) our data present a strong case against the mainstream philosophical view called the immunity principle (IEM). We argue that it is possible for misrepresentation to occur in the subject's sense of “experiential ownership” (the sense that I am the one who is having this bodily experience). We discuss these findings and conclude that not only the sense of body ownership but also the sense of experiential ownership call for further interdisciplinary studies. (shrink)

Research on elders’ acceptance of virtual technologies is much needed. Here we studied the user experience of elders (N = 10, mean age = 88.2 years) during virtual biking, an exergame where participants pedal on a cycle ergometer and wear a Head-Mounted Display that provides them an immersive experience of a bike ride. We tested the effects of augmented gaze on user experience. Augmented gaze is a condition in which horizontal head turns yield amplified visual shifts, (...) which is assumed to facilitate visual exploration. User experience was measured by asking participants to rate satisfaction, motivation, sense of presence and sense of safety. We found a very good acceptance of virtual biking and no signs of negative effects of augmented gaze. These preliminary observations suggest that augmented gaze may be a viable optimization of elders’ experience with certain virtual reality applications. (shrink)

Self-location—the sense of where I am in space—provides an experiential anchor for one's interaction with the environment. In the studies of full-body illusions, many researchers have defined self-location solely in terms of body-location—the subjective feeling of where my body is. Although this view is useful, there is an issue regarding whether it can fully accommodate the role of 1PP-location—the sense of where my first-person perspective is located in space. In this study, we investigate self-location by comparing body-location and 1PP-location: using (...) a head-mounted display (HMD) and a stereo camera, the subjects watched their own body standing in front of them and received tactile stimulations. We manipulated their senses of body-location and 1PP-location in three different conditions: the participants standing still (Basic condition), asking them to move forward (Walking condition), and swiftly moving the stereo camera away from their body (Visual condition). In the Walking condition, the participants watched their body moving away from their 1PP. In the Visual condition, the scene seen via the HMD was systematically receding. Our data show that, under different manipulations of movement, the spatial unity between 1PP-location and body-location can be temporarily interrupted. Interestingly, we also observed a “double-body effect.” We further suggest that it is better to consider body-location and 1PP-location as interrelated but distinct factors that jointly support the sense of self-location. (shrink)

In this book, Grant Tavinor, well known for his influential work on the aesthetics of videogames, offers the first focused study of the aesthetics of virtual reality media. When reading the first pages, one cannot help but notice Tavinor’s enthusiasm about virtual reality (VR) in the vivid descriptions of his explorations of virtual haunted houses, distant planets, and ancient Rome. These descriptions also reveal Tavinor’s refreshing aim to focus on present uses of VR media, instead of the so-called “perfect virtual (...) realities” (virtual realities that are indistinguishable from the actual world) that are often the focus of philosophical discussions. When talking about VR, philosophers indeed often target hypothetical situations in which people are brains in vats, hooked up to experience machines, or living in a world that is, unbeknownst to them, merely a simulated one. Tavinor, however, intends to avoid metaphysical or ontological questions about hypothetical virtual realities, instead focusing on our aesthetic experiences of concrete VR media. With this, he generally refers to “immersive, interactive, and computable VR technologies” (p. 15), such as the HTC Vive, the PlayStation VR, and the Oculus, which depict virtual environments through head mounted displays. Tavinor’s aim is to show how these systems are media that allow for “a technologically fancy kind of picturing” (p. 12), and to contextualize them in the history of representational media alongside of painting, photography, and film. (shrink)

Humans routinely modify their walking speed to adapt to functional goals and physical demands. However, damage to the central nervous system often results in abnormal modulation of walking speed and increased risk of falls. There is considerable interest in treatment modalities that can provide safe and salient training opportunities, feedback about walking performance, and that may augment less reliable sensory feedback within the CNS after injury or disease. Fully immersive virtual reality technologies show benefits in boosting training-related gains in walking (...) performance; however, they lack views of the real world that may limit functional carryover. Augmented reality and mixed reality head-mount displays provide partially immersive environments to extend the virtual reality benefits of interacting with virtual objects but within an unobstructed view of the real world. Despite this potential advantage, the feasibility of using MR-HMD visual feedback to promote goal-directed changes in overground walking speed remains unclear. Thus, we developed and evaluated a novel mixed reality application using the Microsoft HoloLens MR-HMD that provided real-time walking speed targets and augmented visual feedback during overground walking. We tested the application in a group of adults not living with disability and examined if they could use the targets and visual feedback to walk at 85%, 100%, and 115% of each individual’s self-selected speed. We examined whether individuals were able to meet each target gait speed and explored differences in accuracy across repeated trials and at the different speeds. Additionally, given the importance of task-specificity to therapeutic interventions, we examined if walking speed adjustment strategies were consistent with those observed during usual overground walking, and if walking with the MR-HMD resulted in increased variability in gait parameters. Overall, participants matched their overground walking speed to the target speed of the MR-HMD visual feedback conditions. The percent inaccuracy was approximately 5% across all speed matching conditions and remained consistent across walking trials after the first overall walking trial. Walking with the MR-HMD did not result in more variability in walking speed, however, we observed more variability in stride length and time when walking with feedback from the MR-HMD compared to walking without feedback. The findings offer support for mixed reality-based visual feedback as a method to provoke goal-specific changes in overground walking behavior. Further studies are necessary to determine the clinical safety and efficacy of this MR-HMD technology to provide extrinsic sensory feedback in combination with traditional treatments in rehabilitation. (shrink)

To offer engaging neurorehabilitation training to neurologic patients, motor tasks are often visualized in virtual reality. Recently introduced head-mounted displays allow to realistically mimic the body of the user from a first-person perspective in a highly immersive VR environment. In this immersive environment, users may embody avatars with different body characteristics. Importantly, body characteristics impact how people perform actions. Therefore, alternating body perceptions using immersive VR may be a powerful tool to promote motor activity in neurologic patients. However, (...) the ability of the brain to adapt motor commands based on a perceived modified reality has not yet been fully explored. To fill this gap, we “tricked the brain” using immersive VR and investigated if multisensory feedback modulating the physical properties of an embodied avatar influences motor brain networks and control. Ten healthy participants were immersed in a virtual environment using an HMD, where they saw an avatar from first-person perspective. We slowly transformed the surface of the avatar from human to stone. We enforced this visual change by repetitively touching the real arm of the participant and the arm of the avatar with a hammer, while progressively replacing the sound of the hammer against skin with stone hitting sound via loudspeaker. We applied single-pulse transcranial magnetic simulation to evaluate changes in motor cortical excitability associated with the illusion. Further, to investigate if the “stone illusion” affected motor control, participants performed a reaching task with the human and stone avatar. Questionnaires assessed the subjectively reported strength of embodiment and illusion. Our results show that participants experienced the “stone arm illusion.” Particularly, they rated their arm as heavier, colder, stiffer, and more insensitive when immersed with the stone than human avatar, without the illusion affecting their experienced feeling of body ownership. Further, the reported illusion strength was associated with enhanced motor cortical excitability and faster movement initiations, indicating that participants may have physically mirrored and compensated for the embodied body characteristics of the stone avatar. Together, immersive VR has the potential to influence motor brain networks by subtly modifying the perception of reality, opening new perspectives for the motor recovery of patients. (shrink)

In a recent study (Chen et al., 2018), we conducted a series of experiments that induced the “four-hand illusion”: using a head-mounted display (HMD), the participant adopted the experimenter’s first-person perspective (1PP) as if it was his/her own 1PP. The participant saw four hands via the HMD: the experimenter’s two hands from the adopted 1PP and the subject’s own two hands from the adopted third-person perspective (3PP). In the active four-hand condition, the participant tapped his/her index fingers, (...) imitated by the experimenter. Once all four hands acted synchronously and received synchronous tactile stimulations at the same time, many participants felt as if they owned two more hands. In this paper, we argue that there is a philosophical implication of this novel illusion. According to Merleau-Ponty (1945/1962) and Legrand (2010), one can experience one’s own body or body-part either as-object or as-subject but cannot experience it as both simultaneously, i.e., these two experiences are mutually exclusive. Call this view the Experiential Exclusion Thesis. We contend that a key component of the four-hand illusion—the subjective experience of the 1PP-hands that involved both “kinesthetic sense of movement” and “visual sense of movement” (the movement that the participant sees via the HMD)—provides an important counter-example against this thesis. We argue that it is possible for a healthy subject to experience the same body-part both as-subject and as-object simultaneously. Our goal is not to annihilate the distinction between body-as-object and body-as-subject, but to show that it is not as rigid as suggested by the phenomenologists. (shrink)

Paisley Livingston on Stanislaw Lem and the history and philosophy of Virtual Reality. The technologies and speculations associated with “virtual reality” and cognate terms have recently made it possible for scores of journalists and academics to develop variations on a favorite theme - the newness of the new, and more specifically, the newness of that new and wildly different world-historical epoch, era, or Zeitgeist into which we are supposedly entering with the creation of powerful new machines of simulation. The innovative (...) powers of the machines of virtual reality are so extensive, it would seem, that they are even supposed to be able to achieve the extraordinary feat of revitalizing that tired journalist genre, “gee-whiz” scientific reporting. “Gee whiz,” one can now read, “you just put on a data glove and don the head-mounted display helmet, and step right into a whole new world where the old reality - and even the tired, old-fashioned notion of reality as such - gets replaced by the non-existent reality simulated by the machine. You can fight battles and have sex with people who aren’t anywhere near you, or who never even existed. Why you can actually, I mean really, interact with an illusion!”. (shrink)

Virtual Reality (VR), especially in a technologically focused discourse, is defined by a class of hardware and software, among them head-mounted displays (HMD); navigation and pointing devices; and stereoscopic imaging. This presentation examines an experiential aspect of VR. Putting virtual in front of reality modifies the ontological status of a class of experience that of reality. Reality has also been modified (by artists, new media theorists, technologists and philosophers) as augmented, mixed, simulated, artificial, layered and enhanced. Modifications of (...) reality are closely tied to modifications of perception. Media theorist Roy Ascott creates a model of three VRs: verifiable reality, virtual reality and vegetal (entheogenically induced) reality. The ways in which we shift our perceptual assumptions, create and verify illusions and enter the willing suspension of disbelief that allows us entry into imaginal worlds is central to the experience of VR worlds, whether those worlds are explicitly representational (robotic manipulations) or explicitly imaginal (artistic creations). The early rhetoric surrounding VR was interwoven with psychedelics, a perception amplified by Timothy Leary's presence on the historic SIGGRAPH panel, and the Wall Street Journal's tag of VR as electronic LSD. This article discusses the connections philosophical, social-historical and psychological-perceptual between these two domains. (shrink)

Unilateral spatial neglect is a disorder characterized by the failure to report, respond to, or orient toward the contralateral side of space to a brain lesion. Current assessment methods often fail to discover milder forms, cannot differentiate between unilateral spatial neglect subtypes and lack ecological validity. There is also a need for treatment methods that target subtypes. Immersive virtual reality systems in combination with eye-tracking have the potential to overcome these shortcomings, by providing more naturalistic environments and tasks, with sensitive (...) and detailed measures. This systematic review examines the state of the art of research on these technologies as applied in the assessment and treatment of USN. As we found no studies that combined immersive VR and ET, we reviewed these approaches individually. The review of VR included seven articles, the ET review twelve. The reviews revealed promising results. All included studies found significant group-level differences for several USN measures. In addition, several studies found asymmetric behavior in VR and ET tasks for patients who did not show signs of USN in conventional tests. Particularly promising features were multitasking in complex VR environments and detailed eye-movement analysis. No VR and only a few ET studies attempted to differentiate USN subtypes, although the technologies appeared appropriate. One ET study grouped USN participants using individual heatmaps, and another differentiated between subtypes on drawing tasks. Regarding ecological validity, although no studies tested the prognostic validity of their assessment methods, VR and ET studies utilized naturalistic tasks and stimuli reflecting everyday situations. Technological characteristics, such as the field of view and refresh rate of the head-mounted displays, could be improved, though, to improve ecological validity. We found no studies that utilized VR or ET technologies for USN treatment up until the search date of the 26th of February 2020. In conclusion, VR-ET-based systems show great potential for USN assessment. VR-ET holds great promise for treatment, for example, by monitoring behavior and adapting and tailoring to the individual person’s needs and abilities. Future research should consider developing methods for individual subtypes and differential diagnostics to inform individual treatment programs. (shrink)

This paper analyzes from a pragmatic postphenomenological point of view the performative practice of CREW, a multi-disciplinary team of artists and researchers. It is our argument that this company, in its use of new immersive technologies in the context of a live stage, gives rise to a dialectics between an embodied and a disembodied perspective towards the perceived world. We will focus on W (Double U), a collaborative interactive performance, where immersive technology is used for live exchange of vision. By (...) means of a head mounted omni-directional camera and display the fields of vision of two participants are swapped, which enables the participants to perceive the world through another person’s point of view. This intermedial experience brings a classic dichotomic perception of space to falter: material reality as a ‘live’ condition can no longer be opposed to a virtual mediated reality. In the shifting moment between the embodied and the perceived world, on the fracture between what one sees and what one feels, the distinction between live and mediated is blurred, moreover, can no longer be made. The perception of the body is pushed to the extreme, causing a most confusing corporal awareness, a condition that intensifies the experience and causes an altered sense of presence. In a dynamic cognitive negotiation, one tends, however, to unify the divergent ontologies of the ‘real’ and the ‘virtual’ to a meaningful experience. In this respect, we refer to recent neurological experiments such as the ‘rubber hand illusion’ in order to clarify the spectator’s tendency to fuse both ontologies and to embody a coherent image-world. (shrink)

This thesis mounts an attack against accounts of perceptual justification that attempt to analyze it in terms of evidential justifiers, and has defended the view that perceptual justification should rather be analyzed in terms of non-evidential justification. What matters most to perceptual justification is not a specific sort of evidence, be it experiential evidence or factive evidence, what matters is that the perceptual process from sensory input to belief output is reliable. I argue for this conclusion in the following way. (...) Chapter 1: The Arguments from HallucinationChapter 1 presents a skeptical argument from hallucination that starts from a premise about the alleged introspective indistinguishability of perception and hallucination, and concludes that perceptual knowledge is impossible. Underlying this argument are certain assumptions about the nature of perceptual justification, and different responses to the argument portray different views of perceptual justification. Evidentialism and dogmatism both reject the premise that appearances do not provide evidence sufficient for perceptual knowledge, although they disagree about the precise nature of the appearances. Epistemological disjunctivism rejects the premise that introspectively indistinguishable experiences provide the same evidence, while upholding the idea that some sort of evidence, namely factive evidence, is necessary for perceptual justification and knowledge. Process reliabilism rejects the premise that evidence is necessary for perceptual knowledge on the grounds that even perceptual justification can be obtained without evidence, as long as the cognitive process producing the belief is reliable.Chapter 2: EvidentialismChapter 2 starts by introducing some motivations for experientialist views of perceptual justification, such as evidentialism and dogmatism, which hold that conscious experiences evidentially justify perceptual beliefs. These motivations have to do with their ability to accommodate the New Evil Demon Intuition that demon-deceived subjects have justified perceptual beliefs and the Blindsight Intuition that blindsighters do not have justified perceptual beliefs. However, experientialist views are also faced with a Sellarsian dilemma: either experience is construed as non-propositional, but then the proposed evidential relation is unclear, or experience is construed as propositional, but then it is ad hoc to hold that they can evidentially justify without being justified themselves.Chapter 2 continues with a discussion of evidentialism, which grasps the first horn of this dilemma. I argue that evidentialism cannot adequately explain why a non-propositional experience constitutes evidence for this rather than that belief, and also does not provide any account of how to determine which belief fits an evidence-set which partly consists out of non-propositional experiences. Although a reliabilist version of evidentialism can provide a better account of these matters, it suffers from counter-intuitive predictions about justification and a conception of evidence that is so liberal that it could even include blindsighters and clairvoyants as having such evidence.Chapter 3: DogmatismChapter 3 focuses on variants of dogmatism, a theory of perceptual justification that grasps the second horn of the Sellarsian dilemma by holding that a perceptual experience with the content that p is sufficient for immediate prima facie justification of the belief that p. I first argue that dogmatism should identify perceptual experiences with high-level conscious states to accommodate the problem of novice vs. expert identification and the problem of the speckled hen. I then argue that this version of dogmatism still fails to meet a certain explanatory challenge which I dub the `Distinctiveness Problem'. Dogmatism should explain what is so distinctive about perceptual experience that enables it, in contrast with desire and imagination, to evidentially justify the belief that p without, in contrast with belief, being justified itself.Phenomenalist answers to this problem fail because they either do not provide a distinctive property of perceptual experience, or else provide a property that is reducible to or possibly caused by beliefs. In both cases, dogmatism would have the result that intuitively unjustifying experiences, such as imaginations, nevertheless become capable of justifying beliefs. Moreover, phenomenalists still need some explanation of why phenomenology is epistemically relevant at all.A new variant of the problem of the speckled hen is an intuitive illustration of this point against dogmatists. If a perceptual experience that p is not reliably connected to the fact that p or the belief that p, then beliefs based on this experience simply will not be intuitively justified. One possible response to this problem incorporates reliability into the content of experience in the sense that an experience cannot have the content that p if it is not reliably connected to both the fact that p and the belief that p. However, this will lose the motivation from the New Evil Demon Scenario, and will make large concessions towards reliabilism.Chapter 4: Epistemological DisjunctivismGiven these problems for experientialist views of perceptual justification, chapter 4 focuses on a different evidential account of justification: epistemological disjunctivism. According to the Justified True Belief version of Epistemological Disjunctivism, the fact that I see that p is the factive and reflectively accessible evidence in virtue of which I know that p. I argue that JTBED faces formidable problems: first, it cannot adequately deal with the basis problem, second, it cannot accommodate the New Evil Demon Intuition, third,it faces the problem of hyper-intellectualization, and fourth, it has no good account of reflective access.Knowledge First Epistemological Disjunctivism, in contrast, holds that seeing that p just is a way of knowing that p. The fact that I see that p constitutes my justification for believing that p, even though it is not necessary for my knowledge that p. Although this view solves most of the above problems, I argue that KFED still faces a challenge of its own: its notion of justification is so strong that justification entails knowledge but is not itself entailed by it. This means that it too faces a hyper-intellectualization objection because it cannot accommodate animal justification, and that it too will struggle to accommodate the New Evil Demon Intuition.Nevertheless, there is something to the epistemological disjunctivist idea that higher-order capabilities are important to perceptual justification. Specifically, higher-order capabilities provide one with a way of accommodating the Blindsight Intuition without appealing to the notion of experiential evidence: blindsighters are epistemically worse off than normal human perceivers because they lack higher-order beliefs about how they are gaining their information. If one holds that these higher-order beliefs provide a special sort of justification for perceptual beliefs, then blindsighters lack this type of justification. Chapter 5: Process ReliabilismAfter displaying the problems of several evidential accounts of perceptual justification, chapter 5 introduces a non-evidential account: process reliabilism. The classic version of this view holds that the reliability of a belief-forming process is necessary and sufficient for the prima facie justification of a specific set of beliefs, namely, those that arise out of belief-independent processes. Two classic major problems for this view consist of counterexamples to both the necessity and sufficiency of reliability for justification. Although the Generality Problem raises some difficulties for reliabilism, they do not appear to be insurmountable.The second part of chapter 5 focuses on a variety of process reliabilism, inferentialist reliabilism, that is explicitly aimed at responding to clairvoyance cases. According to inferentialist reliabilism, one should distinguish between basic and non-basic beliefs, where basic beliefs are those that result out of the non-inferential operation of an inferentially opaque cognitive system that developed in a natural way. Reliability is only sufficient for the justification of basic beliefs, while non-basic beliefs also require conditional reliability and justification of the beliefs on which they are based.This distinction between basic and non-basic beliefs is meant to answer the challenge arising out of clairvoyance cases because these are all supposedly cases in which the resulting beliefs arenon-basic. However, I argue that the beliefs in these cases come out as non-basic primarily because of the etiological constraint on cognitive systems, a constraint that is unfortunately undermotivated. It seems that beliefs can be justified even if they are produced by a cognitive system that developed by accident, or by a system that was artificially designed to produce those beliefs. So even though the inferentialist reliabilist might have a point in distinguishing between basic and non-basic beliefs, it is still in need of a different response to clairvoyance cases. Chapter 6: Rejoinders for ReliabilismChapter 6 improves on the inferentialist reliabilist account of justification by presenting a different way of dealing with the clairvoyance cases and New Evil Demon Scenario. I start from the empirically plausible idea that we know that we are perceiving when we are perceiving, not because of the use of experiential evidence, but rather, because of an unconscious source-monitoring mechanism. I then argue that the existence of such a source-monitoring mechanism could be used to explain why clairvoyance cases actually have to do with defeat rather than absence of prima facie justification: beliefs that pop up in our head should be recognized as stemming from untrustworthy sources, and so we acquire defeating higher-order beliefs about the first-order beliefs. I also argue that this defeat should be able to occur even if the higher-order beliefs are themselves unjustified. This defeater-account of clairvoyance is preferable to several externalist alternatives. Making reliability relative to a specific world seems rather ad hoc, and further requirements on justification, such as evidence-based belief, cognitively integrated belief, or properly produced belief, all appear unnecessary and are susceptible to adapted versions of the clairvoyance case.I further argue for an alternative inferentialist reliablist response to the New Evil Demon Intuition which treats it as mistaken rather than correct. The New Evil Demon Intuition might arise because of a mistaken view of actual perceptual justification as having to do with experiential evidence. This mistaken view could be explained by the fact that experience is actually reliably connected to belief and is often cited in response to a knowledge-challenge. If this is a correct analysis of the New Evil Demon Intuition, then there is an element of question-begging involved when this scenario is still pressed against inferentialist reliabilists who do not adhere to the experientialist assumption it presupposes.With the inferentialist reliabilist account in hand,we are able to see that many of the premises of the epistemological argument from hallucination are problematic. Evidence does not appear to be required for perceptual knowledge, as perceptual justification does not even require such evidence. Moreover, if we accept a reliabilist model of introspection, then we are often able to know on the basis of introspection that we are perceiving rather than hallucinating. Once one gets clear about the alternatives, it becomes apparent that the argument thrives on internalist assumptions about justification and knowledge that one need not accept. (shrink)

In Codex Ambrosianus of the Syro-Hexapla, marginal readings related to the headings of some of the Psalms occur. The importance of these variants for the history of the Greek and Syriac Psalm headings warrants further discussion. To this end, this paper undertakes a comparative study of the marginal notes that accompany the headings of the Psalms in the Syro-Hexapla. These notes do not occur for all headings and only rarely do variants from all three occur. These variants are compared to (...) the readings of the headings of the Septuagint and the Syro-Hexapla. Three matters are investigated in this paper, namely the rendering of the technical term לַמְנַצֵּ֥חַ in the Three, references to the name of David and some instances where the LXX has a substantial plus in comparison to the Masoretic Text, such as in Psalms 98, 104, 43 and 56. Research to date demonstrates that Field did not use these notes in Codex Ambrosianus to their full extent. As far as the three elements under investigation are concerned, this paper demonstrates that the Three frequently differ from the LXX in their rendering of certain aspects of the headings. In some instances, the Three reflect a rendering much closer to the Hebrew. In others, they contain a rendering that is dependent on the Hebrew, but which displays a lack of understanding of especially some of the technical terms in the Hebrew.Contribution: The research shed new light on the variants recorded in the margin of Codex Ambrosianus and their value for the text-critical study of the headings in the Psalms in the MT and the Septuagint. Textual Criticism is one of the core disciplines for the study of the text of the Hebrew Bible and its translation and transmission in different ancient languages. (shrink)

The vast visual coverage of the Boxer Uprising in northern China that ended with foreigners traipsing through the Forbidden City in Beijing reflects both the richly innovative image technology at the turn of the century and the international interest in events that involved many of the world’s most powerful nations. Historians and students who seek to understand the incident through the innovative technology of today can, for the first time, access primary source images in large numbers malleably displayed in the (...) digital environment. The sheer volume of images collected in one place offers powerful new insights into a history already broadly covered in analytical texts and first-person accounts. One qualitative difference from previous histories is the emergence of subjective points of view that can be conveyed in multidimensional models that juxtapose experiential recordings of the day. Harnessing the tension of contrasting viewpoints – who knew what when – enables today’s learners to see through the lenses of past participants whose understanding was limited by location, communications and, one must remember, by not knowing the outcome. Those who were besieged in the Foreign Legations did not know if they would survive; soldiers and rebels on the road to Beijing knew only the difficulties of the march; illustrations in newspaper reports overseas were coloured by politics and both national and international rivalries. Digital visual representations have the possibility of recreating the collision of experiences that allow users to move between personal records and public reporting from the time to gain a knowledge that is unmitigated by an author’s text-based presentation and conclusions. The result is as much a revolution in perception of historical events – perception-based learning – as it is in information about these events. (shrink)

The case of Vo v. France represents the latest phase of the European Court of Human Rights’ thinking on the scope of Article 2 of the European Convention on Human Rights (the right to life) in relation to foetal life where a foetus had been lost owing to a medical accident. The Court by a majority decided that, “even assuming” Article 2 applied to the instant case (albeit to the life of the pregnant woman rather than that of the foetus), (...) it had not been violated. While the facts in Vo were extreme and exceptional, the Court will shortly hear the case of D v. Ireland concerning access to abortion for foetal anomaly, an application made under Articles 3, 8, 10 and 14 of the European Convention. If the case of D were declared admissible, the Court would then have to consider whether a denial of access to abortion for foetal anomaly constitutes inhuman and degrading treatment contrary to Article 3, or an interference with a pregnant woman’s right to respect for private life under Article 8 (and if so, how the doctrine of the margin of appreciation applies). The Grand Chamber precedent of Vo displays ambivalence about whether Article 2 should apply to foetal life, and its resort to the “even assuming” formula spared Member States the difficulty of having to justify their various abortion regimes, by reference to this Article. It remains to be seen whether in a case like D that is directly concerned with abortion, the Court will take a more definite stance on the correct balance to be struck between the State’s interest in protecting foetal life and the Convention rights of pregnant women. (shrink)

Dinner times provide rich opportunities for overt and covert socialization. Drawing upon a larger corpus of 35 video-recorded family meals involving the three-year-old Zoe and her parents, this conversation analytic study describes how Zoe displays such agency through the practice of “voicing control” – momentarily sounding and acting like an adult by performing a range of controlling acts such as leading, instructing, advising, assessing, and mediating. I argue that by playing with such activities bound to the category of a higher (...) position than hers, the child manages to grow “a head taller” in the Vygotskyan sense. The findings contribute to the budding literature on documenting socialization in naturalistic settings with a specific focus on the child’s role in such socialization. (shrink)

Signed languages employ finely articulated facial and head displays to express grammatical meanings such as mood and modality, complex propositions, information structure, assertions, content and yes/no questions, imperatives, and miratives. In this paper we examine two facial displays: an upper face display in which the eyebrows are pulled together called brow furrow, and a lower face display in which the corners of the mouth are turned down into a distinctive configuration that resembles a frown or upside-down U-shape. (...) Our analysis employs Cognitive Grammar, specifically the control cycle and its manifestation in effective control and epistemic control. Our claim is that effective and epistemic control are associated with embodied actions. Prototypical physical effective control requires effortful activity and the forceful exertion of energy and is commonly correlated with upper face activity, often called the “face of effort.” The lower face display has been shown to be associated with epistemic indetermination, uncertainty, doubt, obviousness, and skepticism. We demonstrate that the control cycle unifies the diverse grammatical functions expressed by each facial display within a language, and that they express similar functions across a wide range of signed languages. (shrink)

Abstract“Scaling-up” is the next hurdle facing the local food movement. In order to effect broader systemic impacts, local food systems (LFS) will have to grow, and engage either more or larger consumers and producers. Encouraging the involvement of mid-sized farms looks to be an elegant solution, by broadening the accessibility of local food while providing alternative revenue streams for troubled family farms. Logistical, structural and regulatory barriers to increased scale in LFS are well known. Less is understood about the way (...) in which scale developments affect the perception and legitimacy of LFS. This value-added opportunity begs the question: Is the value that adheres to local food scalable? Many familiar with local food discourse might suggest that important pieces of added value within LFS are generated by the reconnection of producer and consumer, the direct exchange through which this occurs, and the shared goals and values that provide the basis for reconnection. However, these assertions are based on tenuous assumptions about how interactions within the direct exchange produce value, and how LFS are governed. Examination shows that existing assumptions do not properly acknowledge the hybridity, diversity, and flexibility inherent in LFS. A clear analysis of the potential of scale in LFS will depend on understanding both how value is determined within LFS, and the processes through which these systems are governed. Such an analysis shows that, while scaled-up LFS will be challenged to maintain legitimacy and an identity as “alternative”, the establishment of an open governance process—based on a “negotiation of accommodations”—is likely to enhance their viability. (shrink)

Recent work on formal theories of truth has revived an approach, due originally to Tarski, on which syntax and truth theories are sharply distinguished—‘disentangled’—from mathematical base theories. In this paper, we defend a novel philosophical constraint on disentangled theories. We argue that these theories must be epistemically stable: they must possess an intrinsic motivation justifying no strictly stronger theory. In a disentangled setting, even if the base and the syntax theory are individually stable, they may be jointly unstable. We contend (...) that this flaw afflicts many proposals discussed in the literature; we defend a new, stable disentangled theory, double second-order arithmetic. (shrink)

In debates about the proper analysis of demonstrative expressions, ostensive gestures and speaker intentions are often seen as competing for primary importance in securing reference. Underlying some of these debates is the mistaken assumption that ostensive gestures always make the demonstrated object maximally salient to interlocutors. When we abandon this assumption and focus on an object’s mutually-recognized salience itself, rather than on how the object came to be salient, we can work towards a more promising analysis with a uniform treatment (...) of demonstrative reference whether or not there is an ostensive gesture, and whether reference is ordinary or deferred. (shrink)

Within the class of indexicals, a distinction is often made between “pure” or “automatic” indexicals on one hand, and demonstratives or “discretionary” indexicals on the other. The idea is supposed to be that certain indexicals refer automatically and invariably to a particular feature of the utterance context: ‘I’ refers to the speaker, ‘now’ to the time of utterance, ‘here’ to the place of utterance, etc. Against this view, I present cases where reference shifts from the speaker, time, or place of (...) utterance to some other object, time, or place. I consider and reject the claim that these counterexamples to the automatic indexical theory all involve non-literal uses of indexicals and argue that they cannot be explained away on the grounds that they involve conversational implicature or pretense. (shrink)

I develop a novel argument against the claim that ordinals are sets. In contrast to Benacerraf’s antireductionist argument, I make no use of covert epistemic assumptions. Instead, my argument uses considerations of ontological dependence. I draw on the datum that sets depend immediately and asymmetrically on their elements and argue that this datum is incompatible with reductionism, given plausible assumptions about the dependence profile of ordinals. In addition, I show that a structurally similar argument can be made against the claim (...) that cardinals are sets. (shrink)

Although facial features that are considered beautiful have been investigated across cultures using the framework of sexual selection theory, the effects of head hair on esthetic evaluations have rarely been examined from an evolutionary perspective. In the present study the effects of six hair-styles (short, medium-length, long, disheveled, knot [hair bun], unkempt) on female facial attractiveness were examined in four dimensions (femininity, youth, health, sexiness) relative to faces without visible head hair (“basic face”). Three evolutionary hypotheses were tested (...) (covering hypothesis, healthy mate theory, and good genes model); only the good genes model was supported by our data. According to this theory, individuals who can afford the high costs of long hair are those who have good phenotypic and genetic quality. In accordance with this hypothesis, we found that only long and medium-length hair had a significant positive effect on ratings of women’s attractiveness; the other hairstyles did not influence the evaluation of their physical beauty. Furthermore, these two hairstyles caused a much larger change in the dimension of health than in the rest of the dimensions. Finally, male raters considered the longer-haired female subjects’ health status better, especially if the subjects were less attractive women. The possible relationships between facial attractiveness and hair are discussed, and alternative explanations are presented. (shrink)

Data from neuropsychology do not support the idea that the primary visual cortex necessarily displays internal visual images. However, the choice of formats used in human cognition is not restricted to depictive or descriptive representations. Nestled between pictures and propositions, primitive spatial schemas with simple analog features extracted from pictorial scenes may play a subtle but wide role in cognition.

Core indexicals like ‘I’, ‘here’, and ‘now’ sometimes appear to refer to an object, place, or time other than the speaker, location, or time of utterance. This presents well-known problems for Kaplan's view, which treats reference shifting as a violation of the character rules that give the meaning of indexicals. I propose a view according to which indexical reference is essentially a matter of the mutually-accepted perspective of interlocutors. It follows that contexts need not be ‘proper’ in Kaplan's sense, and (...) a successful convergence of perspectives is needed for indexical reference to succeed. I provide reasons for embracing these conclusions. (shrink)

Ferdinand Mount has been fascinated by the great thinkers and politicians who have shaped human history over the past two millennia In this fascinating, and provocative book, he examines the proposals for a political theory from a number of widely different historical figures. Twelve key people, from the great orator and statesman of Ancient Greece (Pericles) to the inspiration of the founding of the state of Pakistan (Muhammad Iqbal) we take a colourful and rip-roaring journey through the historical figures who (...) have both inspired and provoked Mount in equal measure. The lives of men such as Jesus Christ, Rousseau, Adam Smith, Edmund Burke, and Thomas Jefferson are discussed and comparisons are drawn between the various approaches each figure promoted in their works - whether philosophical, or political theories. For those wishing to be guided by Mount's choices and be swept along by his brilliantly erudite prose, this will be a particular enjoyable read. Lots of colour, humour and passion governed all these people careers and Mount brings them to life like no one else can. Praise for the international-bestselling Tears of the Rajas:- 'Mount is a skilled and fluent writer who does his subject justice' --Literary Review 'Mount relates this remarkable story with a gentle wit, a lightness of touch, a boyish enthusiasm as well as a genius for the telling pen-portrait... It is a remarkable story, and cumulatively amounts to an epic panorama of British Indian history much more substantial than the 'collection of Indian tales, a human jungle book', which Mount modestly describes as his aim in the introduction.' --William Dalrymple, The Spectator 'What [Mount] provides instead is of far greater value: a perceptive antidote to nationalistic prejudicial thinking, and an opportunity for a greater understanding of the aftereffects of British imperialism in some of the world's most troubled regions.' Sunday Times 'Although Tears of the Rajas is replete with stirring tales of adventure, it is a deeply humane book. Mount's heart is at all times with the people of India, whose lives are turned upside down by blundering attempts at modernisation.' The Times. (shrink)

I extend theorems due to Roy Cook on third- and higher-order versions of abstraction principles and discuss the philosophical importance of results of this type. Cook demonstrated that the satisfiability of certain higher-order analogues of Hume's Principle is independent of ZFC. I show that similar analogues of Boolos's new v and Cook's own ordinal abstraction principle soap are not satisfiable at all. I argue, however, that these results do not tell significantly against the second-order versions of these principles.

In lieu of an abstract, here is a brief excerpt of the content:A New Graduate Nurse’s StoryJill MountI was taking pre–med courses on the west coast when my mother was diagnosed with acute leukemia. I immediately finished out my classes, packed up my bags and cat and moved back to the town on the east coast where my parents lived. While my mother was fighting the leukemia, I spent many hours in her hospital room and I learned more about the (...) roles of doctors and nurses. Unlike what I had seen on television, where the doctors were always nearby and available to their patients, my mother’s doctors were seldom present. It was the nurses who spent the most time with my mother in the hospital. I wanted to care and be present for my patients like her nurses. So I decided to become a nurse. I didn’t realize that not all cancer units were like my mother’s where the nurses had time to really care for their patients.My mother’s attending doctor would visit her bedside once a day. The doctor would generally stand a few feet away from the foot of my mother’s bed and describe my mother’s latest blood counts. The doctor always seemed to keep her distance at the foot of the bed. As my mother’s series of chemotherapy treatments failed to put her in remission, the doctor would describe the next chemotherapy protocol that my mother would endure. My mother wanted desperately to live and she would keep copies of the blood counts her doctor provided her and would insist on trying the next round of chemotherapy, despite the list of grim side effects each seemed to come with. The doctor generally stayed an average of five minutes during these visits.My mother’s nurses, however, were a constant presence. I had not realized at the time that people are hospitalized primarily for nursing care. My mother was assigned several great nurses, who not only took her vital signs and administered her medications, but who seemed to care about her as a person as well. The nurses seemed to understand how difficult it was for my mother, a very independent person, not to have control over her health. To help her regain control, they provided her with guided visualizations. This was during the mid–eighties so they had her visualize her immune system as Pac–man eating all the cancer cells. My mother liked this because when she did the Pac– man visualizations, she felt she had some control directing her immune system to fight the disease.The nurses also provided my mother with emotional support. We were not a very physically affectionate family and the nurses encouraged us to give my mother hugs when she was not at risk for infections. They also gave her lots of back rubs. One of the nurses gave my mother a relaxation audiotape, which she listened to for hours, others provided her with poetry books. I believe it was partly the nurses’ physical and emotional care that enabled my mother to live as long and to fight the cancer for as long as she did. During the course of my mother’s illness, she received five rounds of chemotherapy over a period of ten months. Unfortunately her efforts to combat the cancer were unsuccessful and she died of complications of the disease and from the cumulative toxic side effects of the chemotherapy.After observing all the ways the nurses cared for my mother, I decided this was what I wanted to do and I decided to go to nursing school instead of medical school. I was able to apply my pre–med prerequisite courses to an accelerated nursing program [End Page E16] and I graduated with my bachelors in nursing after 18 months of nursing school.My nursing program emphasized the importance of viewing the patient as a whole person and not merely viewing them in terms of a particular disease or condition. Nursing school also reinforced how important nurse caring was for patients. I remember one of our exam questions focused on caring. The question was about a nurse walking into a patient’s room and finding the patient... (shrink)