A motivational system approach to avoidance behavior is presented. According to this approach, a motivational state increases the probability of relevant response patterns and establishes the appropriate or “ideal” consummatory stimuli as positive reinforcers. In the case of feeding motivation, for example, hungry rats are likely to explore and gnaw, and to learn to persist in activities correlated with the reception of consummatory stimuli produced by ingestion of palatable substances. In the case of defense motivation, fearful rats are likely to (...) flee or freeze, and to learn to persist in activities correlated with consummatory stimuli produced by flight from a dangerous place. Defense system activation is distinct from alarm reactions. The latter prepare the animal for probable noxious events, involve relatively intense negative affect and extinguish rapidly in situations where the noxious event no longer occurs. In contrast, defense system activation potentiates innate and modified defense reactions, thus preparing the animal for possible, but not necessarily probable, noxious events; it involves little or no negative affect and extinguishes very slowly when the noxious event no longer occurs. With these assumptions and the resulting model we attempt to resolve several long-standing problems in avoidance learning, including the low correlation between negative affect and avoidance performance, differential rates of extinction for avoidance performance and conditioned emotional responses, and evidence that some avoidance responses are much more easily learned than others. In addition, the model has implications for the study of parallels between appetitive and aversive motivation, sign tracking in aversive conditioning, and orientation of flight responses. Historical antecedents and alternative approaches are discussed. (shrink)

One of the most compelling questions still unanswered in neuroscience is how consciousness arises. In this article, we examine visual processing, the parietal lobe, and contralateral neglect syndrome as a window into consciousness and how the brain functions as the mind and we introduce a mechanism for the processing of visual information and its role in consciousness. We propose that consciousness arises from integration of information from throughout the body and brain by the thalamus and that the thalamus reimages visual (...) and other sensory information from throughout the cortex in a default three-dimensional space in the mind. We further suggest that the thalamus generates a dynamic default three-dimensional space by integrating processed information from corticothalamic feedback loops, creating an infrastructure that may form the basis of our consciousness. Further experimental evidence is needed to examine and support this hypothesis, the role of the thalamus, and to further elucidate the mechanism of consciousness. (shrink)

The Global Workspace Theory and Information Integration Theory are two of the most currently accepted consciousness models; however, these models do not address many aspects of conscious experience. We compare these models to our previously proposed consciousness model in which the thalamus fills-in processed sensory information from corticothalamic feedback loops within a proposed 3D default space, resulting in the recreation of the internal and external worlds within the mind. This 3D default space is composed of all cells of the body, (...) which communicate via gap junctions and electrical potentials to create this unified space. We use 3D llustrations to explain how both visual and non-visual sensory information may be filled-in within this dynamic space, creating a unified seamless conscious experience. This neural sensory memory space is likely generated by baseline neural oscillatory activity from the default mode network, other salient networks, brainstem, and reticular activating system. (shrink)

The complex activity of the human brain makes it difficult to get a big picture of how the brain works and functions as the mind. We examine pertinent studies, as well as evolutionary and embryologic evidence to support our theoretical model consisting of separate but interactive layers of human neural activity. The most basic layer involves default mode network (DMN)activity and cardiorespiratory oscillations. We propose that these oscillations support other neural activity and cognitive processes. The second layer involves limbic system (...) activity accompanied by corresponding changes in cardiorespiratory oscillations. The third layer consists of corticothalamic processing and involves higher cortical functions including awareness, cognition,and consciousness. These layers interact to form the complex neural activity of the human brain. Examining the origins and relationships of various neural and physiologic oscillations may provide better understanding of human neurophysiology and consciousness. (shrink)

Studies in Stoicism contains six unpublished and seven republished essays, the latter incorporating additions and changes which Brunt wished to be made. The papers have been integrated and arranged in chronological order by subject matter, with an accessible lecture to the Oxford Philological Society serving as Brunt's own introduction.

The ability to quickly and accurately recognise emotional states is adaptive for numerous social functions. Although body movements are a potentially crucial cue for inferring emotions, few studies have studied the perception of body movements made in naturalistic emotional states. The current research focuses on the use of body movement information in the perception of fear expressed by targets in a virtual heights paradigm. Across three studies, participants made judgments about the emotional states of others based on motion-capture body movement (...) recordings of those individuals actively engaged in walking a virtual plank at ground-level or 80 stories above a city street. Results indicated that participants were reliably able to differentiate between height and non-height conditions (Studies 1 & 2), were more likely to spontaneously describe target behaviour in the height condition as fearful (Study 2) and their fear estimates were highly calibrated with the fear ratings from the targets (Studies 1-3). Findings show that VR height scenarios can induce fearful behaviour and that people can perceive fear in minimal representations of body movement. (shrink)

This paper examines the popular philosophical theory of moral relativism. Traditionally, the theory argues that communities have their own conceptual frameworks of morality that are inaccessible to those outside of the community. Thus, one community cannot give another community a moral reason to change a practice. In this paper, I will examine David Velleman’s version of the theory presented in his book Foundations for Moral Relativism. This version posits that the drive towards mutual interpretability is a universal drive among human (...) communities. From this drive stem all the practices and moral values of communities. However, Velleman does not believe that this implies that communities can understand each others’ conceptual frameworks. In this way, his account remains a normal version of moral relativism. I will argue that there are some cases in which a person can understand a different community’s conceptual framework enough to provide a reason for that community to change a practice. Importantly, my argument will not say that the reasons for change are moral reasons. They will be practical reasons based on the normative fact that human communities should strive towards mutual interpretability. Thus, my account will also maintain the crucial tenets of moral relativism. If accomplished, this argument will add a great power to the theory. (shrink)

Emperor Julian's three-book treatiseContra Galilaeossurvives solely in those Christian sources that quoted it in order to respond to its forceful attack on Christianity. The bulk of these survivals comes from Cyril of Alexandria's twenty-bookContra Iulianum. The recent publication of the first modern critical edition of Cyril's work creates the occasion for a fresh study of the remnants of Julian's text that can be recovered from it. This is especially true for Books 11–20 of Cyril's treatise that are themselves lost and (...) survive only in quotations in later Greek and Syriac sources. The present article undertakes a reassessment of the Julianic material preserved via the Syriac transmission ofContra Iulianum, including several passages hitherto unknown or ignored in earlier studies of Julian's treatise. It provides the Syriac text and English translation of eight passages and contextualizes them in the wider argumentative aim ofContra Galilaeos. (shrink)

A brief case for the useful arts -- The separation of thinking from doing -- To be master of one's own stuff -- The education of a gearhead: from amateur to professional -- The contradictions of the cubicle -- Thinking as doing -- Work, leisure, and full engagement.

In the minds of many, Hox gene null mutant phenotypes have confirmed the direct role that these genes play in specifying the pattern of vertebrate embryos. The genes are envisaged as defining discrete spatial domains and, subsequently, conferring specific segmental identities on cells undergoing differentiation along the antero‐posterior axis. However, several aspects of the observed mutant phenotypes are inconsistent with this view. These include: the appearance of other, unexpected transformations along the dorsal axis; the occurrence of mirror‐image duplications; and the (...) development of anomalies outside the established domains of normal Hox gene expression. In this paper, Hox gene disruptions are shown to elicit regeneration‐like responses in tissues confronted with discontinuities in axial identity. The polarities and orientations of transformed segments which emerge as a consequence of this response obey the rules of distal transformation and intercalary regeneration. In addition, the incidence of periodic anomalies suggests that the initial steps of Hox‐mediated patterning occurs in Hensen's node. As gastrulation proceeds, mesoderm cell cycle kinetics impose constraints upon subsequent cellular differentiation. This results in the delayed manifestation of transformations along the antero‐posterior axis. Finally, a paradigm is sketched in which temporal, rather than spatial axial determinants direct differentiation. Specific, testable predictions are made about the role of Hox genes in the establishment of segmental identity. (shrink)

The essays in this volume all originated at the 2001 conference of the International Society for the Study of Time.

This paper examines the concept of ‘openness with patients’ from the stand-point of the limitations of biomedical ethics. Initially we review contemporary critiques of bioethics and, in particular, of principlism; we relate how other; somewhat neglected, forms of medical ethics can yield useful information and provide moral guidance. The main section of the paper then shows how a bioethical approach to openness misses the social context in our example, the viewpoints of patients; we present some of the increasing wealth of (...) research evidence which points towards patients wanting more information and a greater degree of openness. (shrink)

Time and Memory comprises essays that deal with the nature of memory as a medium that reflects the passage of time, as a tool for the manipulation of time, and as a reflection of the creative and destructive impulse.

For years, both psychologists and the general public have been fascinated with the notion that there are gender differences in cognitive abilities; even now, flashy cover stories exploiting this idea dominate major news magazines, while research focuses on differences in verbal, mathematical, spatial, and scientific abilities across gender. This new volume in the Counterpoints series not only summarizes and addresses the validity of such research, but also questions its ideology and consequences. Why do we search so intently for these differences? (...) And what are the social and cultural implications of this relentless emphasis? Do biological mechanisms, in fact, contribute to the male-female differences in cognition? These are just a few of the questions generated by this controversial topic as it is debated throughout the book. (shrink)