Willensfreiheit wird bestritten, weil sich der Begriff nicht logisch konsistent definieren lässt und weil inzwischen auch neurobiologische Anhaltspunkte gegen ihre Existenz sprechen. Anders als in der biblisch-reformatorischen Tradition gehört die Willensfreiheit aber zum Kern des aufgeklärten Menschenbildes. Und auch in der Theologie scheint die Bestreitung der Willensfreiheit unweigerlich auf die Lehre von der doppelten Prädestination hinauszulaufen, so dass seit Pietismus und Aufklärung auch die evangelische Theologie ihrem Ursprung untreu wurde. In dem Buch werden die Perspektiven der Philosophie, Neurobiologie und Theologie (...) zum Thema Willensfreiheit zusammengeführt. Die Argumente und Befunde gegen Willensfreiheit sind weit stärker als die zu ihren Gunsten. Deswegen existieren bislang nur Positionen, die den Determinismus akzeptieren, oder solche, die aus der Negation des Determinismus doch noch eine Möglichkeit für Willensfreiheit im menschlichen Gehirn zu finden hoffen. Die Studie geht einen völlig neuen Weg, indem sie den Determinismus der Aussenwelt bestreitet, und dies im Anschluss an die erkenntnistheoretischen Debatten über das Wesen des Quantenindeterminismus. Dabei wird aber gerade kein freier Wille postuliert, sondern ein Konzept aktiver Lebensführung entwickelt, in dem Bildung zur Verwirklichung von vorgenommenen Zielen eine besondere Rolle spielt."-- Back cover. (shrink)

On childhood, childhood culture and child perspective in a cross-cultural frame of reference.

This is a response to a short communication on our research presented in Solbrække et al. :89–103, 2017), which raises a series of serious allegations. Our article explored the rise of ‘the breast cancer gene’ as a field of medical, cultural and personal knowledge. We used the concept biological citizenship to elucidate representations of, and experiences with, hereditary breast cancer in a Norwegian context, addressing a research deficit. In our response to Møller and Hovig’s :239–242, 2018a) opinionated piece, we start (...) by questioning on which scientific grounds they base their knowledge claims and situate their criticism in a pre-determined positivist script, which exposes their incompetency when it comes to establishing a useful critique of our research. We tie this to an attitude of scientific supremacy, which reduces the complexity and specificity of different knowledges into a clichéd divide between ‘hard evidence’ and ‘fiction’—presented in a predictable narrative which seeks to establish research protagonists and antagonists. We elaborate on the rationale of our qualitative approach to analyzing and interpreting situated and mediated aspects of BRCA 1/2. We counter claims that our research does harm to patients. We refer to a medical scandal emerging from Norway where 21 women were wrongfully diagnosed and surgically treated for a mis-interpreted cancer gene mutation. In conclusion, we stand by the integrity of our research as reported in the original paper. Scientific supremacy and pre-scripted criticism impose considerable obstacles for the possibility of establishing interdisciplinary dialogue across knowledge paradigms in health care and medicine. We therefore urge readers to reflect on how we can establish and sustain ethically careful and truthful dialogue—without doing violence to epistemological differences—to protect and advance the interdisciplinarity that constitutes the journal’s scope. (shrink)

In this discussion, Steve Fuller’s book Dissent over Descent is criticized mainly because he draws conclusions from wishful thinking and uses ancient and medieval scientists as well as theologians in his efforts to invalidate the theory of evolution. He is also criticized for drawing universal conclusions from a Eurocentric version of history. If science and technology studies is to regain its reputation, its representatives have to use relevant statements and argue more rationally.

In the age of the digital generation, written public data is ubiquitous and acts as an outlet for today's society. Platforms like Facebook, Twitter, Google+ and LinkedIn have profoundly changed how we communicate and interact. They have enabled the establishment of and participation in digital communities as well as the representation, documentation and exploration of social behaviours, and had a disruptive effect on how we use the Internet. Such digital communications present scholars with a novel way to detect, observe, analyse (...) and understand online communities over time. This article presents the formalization of a Social Observatory: a low latency method for the observation and measurement of social indicators within an online community. Our framework facilitates interdisciplinary research methodologies via tools for data acquisition and analysis in inductive and deductive settings. By focusing our Social Observatory on the public Facebook profiles of 187 federal German politicians we illustrate how we can analyse and measure sentiment, public opinion, and information discourse in advance of the federal elections. To this extent, we analysed 54,665 posts and 231,147 comments, creating a composite index of overall public sentiment and the underlying conceptual discussion themes. Our case study demonstrates the observation of communities at various resolutions: “zooming” in on specific subsets or communities as a whole. The results of the case study illustrate the ability to observe published sentiment and public dialogue as well as the difficulties associated with established methods within the field of sentiment analysis within short informal text. (shrink)

In 1976 an interdisciplinary study on risks and risk evaluations was inaugurated in Sweden and was sponsored by the Committee for Future-oriented Research. One of the basic assumptions of the Swedish risk project was that modern society has created “new, increasingly complicated and large-scale technical systems.” It also assumed that “large systems are economically efficient, but vulnerable and therefore create risks.” A third assumption was that “the ever rising standard of living is purchased at the cost of certain additional risks.” (...) The perspective of the project was thus markedly historically oriented. (shrink)

Organizational changes are common in elder care today. Such changes affect caregivers, who are essential to providing good quality care. The aim of the present study was to illuminate caregivers’ experiences of working in elder care while under threat of organizational change and termination notice. Qualitative content analysis was used to examine interview data from 11 caregivers. Interviews were conducted at three occasions during a two‐year period. The findings show a transition in their experiences from ‘having a professional identity and (...) self‐confidence’, to ‘being a professional in a threatening situation caused by someone else’ and to ‘struggling to adapt to a changed working environment as a person and a professional’. The caregivers experienced a loss of pride and satisfaction. Previous literature indicates that this may have consequences for the quality of care and that employees may be at risk of negative health effects. However, the caregivers continued to struggle, doing their best to complete their duties. The study has implications for high‐level decision‐makers, managers and caregivers in similar work–life situations in that it deals with factors that facilitate or impede similar transitions. (shrink)

Ontologies are the prime way of organizing data in the Semantic Web. Often, it is necessary to combine several, independently developed ontologies to obtain a complete representation of a domain of interest. The complementarity of existing ontologies can be leveraged by merging them. Existing approaches for ontology merging mostly implement a binary merge. However, with the growing number and size of relevant ontologies across domains, scalability becomes a central challenge. A multi-ontology merging technique offers a potential solution to this problem. (...) We present Co Merger, a scalable multiple ontologies merging method. It takes as input a set of source ontologies and existing mappings across them and generates a merged ontology. For efficient processing, rather than successively merging complete ontologies pairwise, we group related concepts across ontologies into partitions and merge first within and then across those partitions. In both steps, user-specified subsets of generic merge requirements (GMRs) are taken into account and used to optimize outputs. The experimental results on well-known datasets confirm the feasibility of our approach and demonstrate its superiority over binary strategies. A prototypical implementation is freely accessible through a live web portal. (shrink)

Les questions de communication sont au coeur des «perceptions du risque» car la grande majorité des risques ne seraient connus que de ceux qui l'expérimentent n'eut été les médias. Le champ historiquement individualiste de la «perception du risque» a manifesté peu d'intérêt pour le contenu des mass media et leur rôle dans la construction d'une pensée sur le risque. Bien au contraire, le processus de «l'information» sur le risque était situé dans la pensée individuelle, la question centrale étant: pourquoi certains (...) risques sont-ils grossis par les individus tandis que d'autres sont minimisés? Les médias jouent un rôle essentiel dans l'amplification de certains risques et les récepteurs de l'information sont considérés comme passifs devant les stimuli médiatiques. Il faut en fait nuancer l'approche pour saisir la dimension profonde de l'appréhension du risque. En passant de la notion de «perception du risque» à celle de «représentation du risque», on peut davantage cerner les liens entre médias et pensée profonde.Issues of communication lie at the heart of "risk perception" since the vast majority of risks would be known to only those who experience them were it not for the mass media. The historically individualist field of "risk perception" has tended to pay little attention to the contents of the mass media and the role these played in constructing risk-related thinking. Rather, the processing of risk "information" was situated within individual’s minds with the central question being: why are some risks overplayed by certain individuals while others more serious risks are underplayed? The media are seen to play a major role in the amplification of certain risks with those who receive such information being viewed as rather passive followers of media signals. The starting point of this paper is the need for a more nuanced approach to the lay dimension of the apprehension of risks. The paper outlines how a shift from "risk perception" to "risk representation" highlights the links between media and lay thinking. (shrink)

Luminance and color are strong and self-sufficient cues to pictorial depth in visual scenes and images. The present study investigates the conditions Under which luminance or color either strengthens or overrides geometric depth cues. We investigated how luminance contrasts associated with color contrast interact with relative height in the visual field, partial occlusion, and interposition in determining the probability that a given figure is perceived as ‘‘nearer’’ than another. Latencies of ‘‘near’’ responses were analyzed to test for effects of attentional (...) selection. Figures in a pair were supported by luminance contrast or isoluminant color contrast and combined with one of the three geometric cues. The results of Experiment 1 show that luminance contrasts associated with hue, when it does not interact with other hues, produces the same effects as achromatic luminance contrasts: The probability of‘‘near’’ increases with luminance contrast while the latencies for ‘‘near’’ responses decrease. Partial occlusion is found to be a strong enough pictorial cue to support a weaker red luminance contrast. Interposition cues lose out against cues of spatial position and partial occlusion. The results of Experiment 2, with isoluminant displays of varying color contrast, reveal that red color contrast on a light background supported by any of the three geometric cues wins over green or white supported by any of the three geometric cues. On a dark background, red color contrast supported by the interposition cue loses out against green or white color contrast supported by partial occlusion. These findings reveal that color is not an independent depth cue, but is strongly influenced by luminance contrast and stimulus geometry. Systematically shorter response latencies for stronger ‘‘near’’ percepts demonstrate that selective visual attention reliably detects the most likely depth cue combination in a given configuration. (shrink)

Wilhelm Bender was professor of systematic theology in Bonn from 1876–1888. Like many of his contemporaries, he steered a course away from mediatory theology via the ‘Ritschlian school’ to liberal theology. His attempt to sublate Darwin's theory of evolution and scientific materialism into an idealistic system of the history of religion and culture set him in sharp opposition to the conservative currents within the Church, costing him his chair. In his efforts to establish a relative absoluteness of Christianity as the (...) highest value discernible in the history of religion he can be seen as a forerunner of Ernst Troeltsch. (shrink)

Le mouvement skinhead se compose de deux entités : les skinheads racistes-nationalistes et les skinheads antiracistes. S’inspirant des théories psychosociologiques relatives aux représentations sociales et aux minorités actives proposées par Serge Moscovici , il décrit les styles de comportement précis de chaque groupe skin, leurs divergences et leurs ressemblances, et analyse la façon dont la société, aidée par les media, ne retient qu’une seule représentation sociale, celle des skinheads nationalistes. Malgré l’univocité de la représentation, ce qui ressort de 19 entretiens (...) avec les skinheads, c’est l’idée de pluralité identitaire combinée à un ancrage urbain très important.The skinhead movement is divided into two groups : the racist-nationalist skinheads and the antiracist skinheads. Taking into account the social-psychological theories of social representations and active minorities, proposed by Serge Moscovici , it describes the styles of behavior of each skin group, their divergences and resemblances and analyses how society, with the help of the media, has built only one social representation of the nationalist skinheads. In spite of this univocal representation, what is underlined through the nineteen interviews with skinheads is a form of plural identity linked to a strong urban anchoring. (shrink)

Les fondements théoriques d'une analyse des activités dans les discours professionnels illustrée par des données issues de rencontres en conseil génétique sont présentés ici. En prenant l'activité comme unité de base de l'action, je me réfère rapidement à «l'activité théorique» proposée par Leontyev, rajoutant les notions de «jeux de langage» de Wittgenstein et de «types d'activités» de Levinson. L'activité d'analyse dans les discours professionnels doit aller au-delà du seul codage des instances de l'usage du langage et doit s'orienter vers la (...) compréhension d'une écologie spécifique de l'activité, incluant les dimensions relationnelles et de rôles des participants présents ou absents. Cette interprétation peut s'analyser en considérant le cadre thématique et interactionnel d'une situation donnée grâce à la prise en compte des propriétés structurelles et relationnelles dans l'usage du langage.In this paper I present a theoretical basis for activity analysis in professional discourse settings followed by an illustration of data from the genetic counseling encounters. By taking activity as the basic unit of action, I briefly draw on "activity theory" as proposed by Leontyev, supplemented by Wittgenstein's notion of "language games" and Levinson's notion of "activity types". I argue that activity analysis in the professional discourse settings has to go beyond mere coding of instances of language use towards an interpretive understanding of the activity-specific ecology, including the role-relational dimensions of co-present and absent participants. Such an interpretive task can be achieved through thematic and interactional mapping of a given encounter by taking into consideration the structural and relational properties situated language use. (shrink)

Ethics education remains in high demand in business schools. Meta-analyses published in the last two decades show that ethics instruction with certain characteristics produce more desirable moral outcomes than other characteristics do. Acknowledging the vast accumulated knowledge on this topic, we believe that the existing evidence base could be overwhelming for ethics educators designing and delivering their courses. Thus, we review the research evidence on the effectiveness of ethics instruction and translate the findings into evidence-led best practices. Adopting the meta-science (...) approach and using a model of training evaluation, we synthesized 8 meta-analyses and 3 quantitative reviews that examine the extent to which ethics instruction types, course duration, instructional techniques and activities, and instructor and student characteristics affect the effectiveness of ethics education. We conclude by making specific recommendations to ethics educators who are interested in designing and delivering evidence-based ethics courses. (shrink)

The major theoretical framework relative to the perception of illusory figures is reviewed and discussed in the attempt to provide a unifying explanatory account for these phenomena.

Following the pioneering studies of the receptive field (RF), the concept gained further significance for visual perception by the discovery of input effects from beyond the classical RF. These studies demonstrated that neuronal responses could be modulated by stimuli outside their RFs, consistent with the perception of induced brightness, color, orientation, and motion. Lesion scotomata are similarly modulated perceptually from the surround by RFs that have migrated from the interior to the outer edge of the scotoma and in this way (...) provide filling-in of the void. Large RFs are advantageous to this task. In higher visual areas, such as the middle temporal and inferotemporal lobe, RFs increase in size and lose most of their retinotopic organization while encoding increasingly complex features. Whereas lowerlevel RFs mediate perceptual filling-in, contour integration, and figure–ground segregation, RFs at higher levels serve the perception of grouping by common fate, biological motion, and other biologically relevant stimuli, such as faces. Studies in alert monkeys while freely viewing natural scenes showed that classical and nonclassical RFs cooperate in forming representations of the visual world. Today, our understanding of the mechanisms underlying the RF is undergoing a quantum leap. What had started out as a hierarchical feedforward concept for simple stimuli, such as spots, lines, and bars, now refers to mechanisms involving ascending, descending, and lateral signal flow. By extension of the bottom-up paradigm, RFs are nowadays understood as adaptive processors, enabling the predictive coding of complex scenes. Top-down effects guiding attention and tuned to task-relevant information complement the bottom-up analysis. (shrink)

This is an introduction to a collection of essays on solidarity. It maps the most important meanings of solidarity at the micro- and macrolevels.

Western media coverage of female genital modifications in Africa has been hyperbolic and one-sided, presenting them uniformly as mutilation and ignoring the cultural complexities that underlie these practices. Even if we ultimately decide that female genital modifications should be abandoned, the debate around them should be grounded in a better account of the facts.

Positive spillover occurs when changes in one behaviour influence changes in subsequent behaviours. Evidence for such spillover and an understanding of when and how it may occur is still limited. This paper presents findings of a one year longitudinal behaviour change project led by a commercial retailer in the UK & Ireland to examine behaviour change and potential spillover of pro-environmental behaviour, and how this may be associated with changes in environmental identity and perceptions of ease and affordability as well (...) as perceptions of how participation in the project has helped support behaviour change. We draw on both quantitative and qualitative. Study 1 examines quantitative data from the experimental and a matched control group. Study 2 reports qualitative findings from a follow up interview study with participants of the experimental group. As expected, we found significant changes in reported pro-environmental behaviour and identity in the experimental group as well as some indications of behavioural spillover. These changes were not significantly associated with changes in environmental identity. The interviews suggested that group dynamics played an important role in facilitating a sense of efficacy and promote sustained behaviour change and spillover. Moreover, the support by a trusted entity was deemed to be of crucial importance. (shrink)

The experiments reported herein probe the visual cortical mechanisms that control near–far percepts in response to two-dimensional stimuli. Figural contrast is found to be a principal factor for the emergence of percepts of near versus far in pictorial stimuli, especially when stimulus duration is brief. Pictorial factors such as interposition (Experiment 1) and partial occlusion Experiments 2 and 3) may cooperate, as generally predicted by cue combination models, or compete with contrast factors in the manner predicted by the FACADE model. (...) In particular, if the geometrical conŽ guration of an image favors activation of cortical bipole grouping cells, as at the top of a T-junction, then this advantage can cooperate with the contrast of the conŽ guration to facilitate a near–far percept at a lower contrast than at an X-junction. Varying the exposure duration of the stimuli shows that the more balanced bipole competition in the X-junction case takes longer exposure times to resolve than the bipole competition in the T-junction case (Experiment 3). (shrink)

Consciousness is known to be limited in processing capacity and often described in terms of a unique processing stream across a single dimension: time. In this paper, we discuss a purely temporal pattern code, functionally decoupled from spatial signals, for conscious state generation in the brain. Arguments in favour of such a code include Dehaene et al.’s long-distance reverberation postulate, Ramachandran’s remapping hypothesis, evidence for a temporal coherence index and coincidence detectors, and Grossberg’s Adaptive Resonance Theory. A time-bin resonance model (...) is developed, where temporal signatures of conscious states are generated on the basis of signal reverberation across large distances in highly plastic neural circuits. The temporal signatures are delivered by neural activity patterns which, beyond a certain statistical threshold, activate, maintain, and terminate a conscious brain state like a bar code would activate, maintain, or inactivate the electronic locks of a safe. Such temporal resonance would reflect a higher level of neural processing, one that is independent from sensorial or perceptual brain mechanisms. (shrink)

The perceived strength of darkness enhancement in the centre of surfaces surrounded or not surrounded by illusory contours was investigated as a function of proximity of the constituent elements of the display and their angular size. Magnitude estimation was used to measure the perception of the darkness phenomenon in white-on-grey stimuli. Darkness enhancement was perceived in both types of the stimuli used, but more strongly in the presence of illusory contours. In both cases, perceived darkness enhancement increased with increasing proximity (...) of the constituent parts of the display and with their angular size. These results suggest that the occurrence of darkness (or brightness) enhancement phenomena in the centre of the displays is not directly related to illusory contours, which only reinforce the subjective surface brightness/darkness. (shrink)

The 18th-century Scottish ‘common sense’ philosopher Thomas Reid argued that perception can be distinguished on several dimensions from other categories of experience, such as sensation, illusion, hallucination, mental images, and what he called ‘fancy.’ We extend his approach to eleven mental categories, and discuss how these distinctions, often ignored in the empirical literature, bear on current research. We also score each category on five properties (ones abstracted from Reid) to form a 5 × 11 matrix, and thus can generate statistical (...) measures of their mutual dependencies, a procedure that may have general interest as illustrating what we can call ‘computational philosophy.’. (shrink)

Alors que la plupart des recherches sur la psychologie sociale des représentations soulignent les aspects symboliques et communicationnels de ces dernières, une tendance subsiste qui consiste à concevoir les processus représentationnels en termes uniquement cognitifs comme si l'essentiel d'une représentation était articulé à une tentative de re-présenter le monde environnant. L'accent mis sur cette fonction des représentations, qui décalquerait en quelque sorte le monde extérieur, a instillé un courant anti-représentationnel qui a desservi la notion de représentation elle-même. Sur ce point, (...) deux aspects sont lacunaires : on ne peut rendre compte de la capacité ontogénétique de la représentation et on ne peut saisir sa fonction symbolique. La genèse des représentations montre qu'elles sont organisées en triades dialogiques ego/alter/objet articulées à des constructions entre personnes, relations ego/alter et monde. En saisissant cette genèse dialogique, on peut consolider les fonctions expressives et dialogiques des représentations qui, conjuguées à sa fonction épistémique sont partie intégrante du processus de construction des savoirs.While current research on the social psychology of representations emphasizes the symbolic and communicative aspects of representation, there remains a tendency to conceive representational processes in purely cognitive terms, as if all that is involved in representation is an attempt to re-present the reality of the world outside. This accent on the representational function qua mental replica of the outside world has engendered an anti-representational stance whose most radical consequence has been the dismissal of the notion of representation. This paper argues that this view fails on two accounts: it cannot provide an ontogenetic account of representation and it is unable to engage with its symbolic function. The genesis of representation shows that its foundations are dialogical triads between self-other-object, which shape it as a symbolic construction of persons, self-other relations and world. Understanding this dialogical genesis consolidates the expressive and dialogical functions of representation which, in conjunction with the epistemic function, are integral to the process of construction of knowledge. (shrink)

Background:The foundation of all nursing practice is respect for human rights, ethical value and human dignity. In perioperative practice, challenging situations appear quickly and operating theatre nurses must be able to make different ethical judgements. Sometimes they must choose against their own professional principles, and this creates ethical conflicts in themselves.Objectives:This study describes operating theatre nurses’ experiences of ethical value conflicts in perioperative practice.Research design:Qualitative design, narratives from 15 operating theatre nurses and hermeneutic text interpretation.Ethical consideration:The study followed ethical principles (...) in accordance with the Helsinki Declaration and approval was granted by the local university ethics committee.Findings:The result showed that value conflicts arose in perioperative practice when operating theatre nurses were prevented from being present in the perioperative nursing process, because of current habits in perioperative practice. The patient’s care became uncaring when health professionals did not see and listen to each other and when collaboration in the surgical team was not available for the patient’s best. This occurred when operating theatre nurses’ competence was not taken seriously and was ignored in patient care.Conclusion:Value conflicts arose when operating theatre nurses experienced that continuity of patient care was lacking. They experienced compassion with the patient but still had the will and ability to be there and take responsibility for the patient. This led to feelings of despair, powerlessness and of having a bad conscience which could lead to dissatisfaction, and even resignations. (shrink)

Light increment thresholds were measured on either side of one of the illusory contours of a white-on-black Kanizsa square and on the illusory contour itself. The data show that thresholds are elevated when measured on either side of the illusory border. These elevations diminish with increasing distance of the target spot from the white elements which induce the illusory figure. The most striking result, however, is that threshold elevations are considerably lower or even absent when the target is located on (...) the illusory contour itself. At an equivalent position in a control figure where no illusory contour is visible, such a threshold decrease does not occur. The present observations add empirical support to neural theories of illusory form perception. (shrink)

Background To characterize patients dying in a community hospital with or without attempting cardiopulmonary resuscitation and to describe patient involvement in, documentation of, and compliance with decisions on resuscitation. Methods All patients who died in Kalmar County Hospital during January 1, 2016 until December 31, 2016 were included. All information from the patients’ electronic chart was analysed. Results Of 660 patients female), 30 were pronounced dead in the emergency department after out-of-hospital CPR. Of the remaining 630 patients a DNAR order (...) had been documented in 558 patients. Seventy had no DNAR order and 2 an explicit order to do CPR. In 43 of these 70 patients CPR was unsuccessfully attempted while the remaining 27 patients died without attempting CPR. In 2 of 558 patients CPR was attempted despite a DNAR order in place. In 412 patients the DNAR order had not been discussed with neither patient nor family/friends. Moreover, in 75 cases neither patient nor family/friends were even informed about the decision on code status. Conclusions In general, a large percentage of patients in our study had a DNAR order in place. However, 27 patients died without CPR attempt or DNAR order. DNAR orders had not been discussed with the patient/surrogate in almost three fourths of the patients. Further work has to be done to elucidate the barriers to discussions of CPR decisions with the patient. (shrink)

This article presents psychophysical evidence that the Kanizsa Square does not produce an 'object superiority effect' previously reported in similar Gestalt configurations. Implications of the findings for Gestalt theory are addressed.

Detection thresholds for a small light spot were measured at various distances from the colinear inucer edges of white inducing elements on a dark background. The data show that thresholds are elevated when the target is located close to one or more inducing element(s). Threshold elevations diminish with increasing distance of the target from colinear edges and decreasing surface size of the inducing elements. gradients show the same tendencies. Tbe present observations add empirical support to the idea that illusory figures (...) are determined by local mechanisms that operate at early stages of perceptual information processing and decision. (shrink)

This article introduces an experimental paradigm to selectively probe the multiple levels of visual processing that influence the formation of object contours, perceptual boundaries, and illusory contours. The experiments test the assumption that, to integrate contour information across space and contrast sign, a spatially short-range filtering process that is sensitive to contrast polarity inputs to a spatially long-range grouping process that pools signals from opposite contrast polarities. The stimuli consisted of thin subthreshold lines, flashed upon gaps between collinear inducers which (...) potentially enable the formation of illusory contours. The subthreshold lines were composed of one or more segments with opposite contrast polarities. The polarity nearest to the inducers was varied to differentially excite the short-range filtering process. The experimental results are consistent with neurophysiological evidence for cortical mechanisms of contour processing and with the Boundary Contour System model, which identifies the short-range filtering process with cortical simple cells, and the long-range grouping process with cortical bipole cells. (shrink)

The thresholds of human observers detecting line targets improve significantly when the targets are presented in a spatial context of collinear inducing stimuli. This phenomenon is referred to as spatial facilitation, and may reflect the output of long-range interactions between cortical feature detectors. Spatial facilitation has thus far been observed with luminance-defined, achromatic stimuli on achromatic backgrounds. This study compares spatial facilitation with line targets and collinear, edge-like inducers defined by luminance contrast to spatial facilitation with targets and inducers defined (...) by color contrast. The results of a first experiment show that achromatic inducers facilitate the detection of achromatic targets on gray and colored backgrounds, but tend to suppress the detection of chromatic targets. Chromatic inducers facilitate the detection of chromatic targets on gray and colored backgrounds, but tend to suppress the detection of achromatic targets. Chromatic spatial facilitation appears to be strongest when inducers and background are isoluminant. The results of a second experiment show that spatial facilitation with chromatic targets and inducers requires a longer exposure duration of the inducers than spatial facilitation with achromatic targets and inducers, which is already fully effective at an inducer exposure of 30 ms only. The findings point towards two separate mechanisms for spatial facilitation with collinear form stimuli: one that operates in the domain of luminance, and one that operates in the domain of color contrast. These results are consistent with neural models of boundary and surface formation which suggest that achromatic and chromatic visual cues are represented on different cortical surface representations that are capable of selectively attracting attention. Multiple copies of these achromatic and chromatic surface representations exist corresponding to different ranges of perceived depth from an observer, and each can attract attention to itself. Color and contrast differences between inducing and test stimuli, and transient responses to inducing stimuli, can cause attention to shift across these surface representations in ways that sometimes enhance and sometimes interfere with target detection. (shrink)

Rhythm perception involves strong auditory-motor connections that can be enhanced with movement. However, it is unclear whether just seeing someone moving to a rhythm can enhance auditory-motor coupling, resulting in stronger entrainment. Rhythmic priming studies show that presenting regular rhythms before naturally spoken sentences can enhance grammaticality judgments compared to irregular rhythms or other baseline conditions. The current study investigated whether introducing a point-light figure moving in time with regular rhythms could enhance the rhythmic priming effect. Three experiments revealed that (...) the addition of a visual cue did not benefit rhythmic priming in comparison to auditory conditions with a static image. In Experiment 1, grammaticality judgments were poorer after audio-visual regular rhythms compared to auditory-only regular rhythms. In Experiments 2 and 3, there was no difference in grammaticality judgments after audio-visual regular rhythms compared to auditory-only irregular rhythms for either a bouncing point-light figure or a swaying point-light figure. Comparison of the observed performance with previous data suggested that the audio-visual component removed the regular prime benefit. These findings suggest that the visual cues used in this study do not enhance rhythmic priming and could hinder the effect by potentially creating a dual-task situation. In addition, individual differences in sensory-motor and social scales of music reward influenced the effect of the visual cue. Implications for future audio-visual experiments aiming to enhance beat processing, and the importance of individual differences will be discussed. (shrink)

Spatial facilitation has been observed with luminance-defined, achromatic stimuli on achromatic backgrounds as well as with targets and inducers defined by colour contrast. This paper reviews psychophysical results from detection experiments with human observers showing the conditions under which spatially separated contour inducers facilitate the detection of simultaneously presented target stimuli. The findings point towards two types of spatial mechanisms: (i) Short-range mechanisms that are sensitive to narrowly spaced stimuli of small size and, at distinct target locations, selective to the (...) contrast polarity of targets and inducers. (ii) Long-range mechanisms that are triggered by longer stimuli, generate facilitation across wider spatial gaps between targets and inducers, and are insensitive to their contrast polarity. Spatial facilitation with chromatic stimuli requires a longer inducer exposure than spatial facilitation with achromatic stimuli, which is already fully effective at inducer exposures of 30 ms. This difference in temporal dynamics indicates some functional segregation between mechanisms for colour and luminance contrast in the perception of space. (shrink)

A simple working taxonomy with three classes of pictorial completion is proposed as an alternative to Pessoa et al.'s classification: area, surface, and contour completion. The classification is based on psychophysical evidence, not on the different phenomenal attributes of the stimuli, showing that pictorial completion is likely to involve mechanistic interactions in the visual system at different levels of processing. Whether the concept of “filling-in” is an appropriate metaphor for the visual mechanisms that may underlie perceptual completion is questioned.

Lehar's Gestalt Bubble model introduces a computational approach to holistic aspects of three-dimensional scene perception. The model as such has merit because it manages to translate certain Gestalt principles of perceptual organization into formal codes or algorithms. The mistake made in this target article is to present the model within the theoretical framework of the question of consciousness. As a scientific approach to the problem of consciousness, the Gestalt Bubble fails for several reasons. This commentary addresses three of these: (1) (...) the terminology surrounding the concept of consciousness is not rigorously defined; (2) it is not made evident that three-dimensional scene perception requires consciousness at all; and (3) it is not clearly explained by which mechanism(s) the “picture-in-the-head,” supposedly represented in the brain, would be made available to different levels of awareness or consciousness. Footnotes1 After Shakespeare, Macbeth. (shrink)

Shepard's concept of internalization does not suggest mechanisms which help to understand how the brain adapts to changes, how representations of a steadily changing environment are updated or, in short, how brain learning continues throughout life. Neural mechanisms, as suggested by Barlow, may prove a more powerful alternative. Brain theories such as Adaptive Resonance Theory (ART) propose mechanisms to explain how representational activities may be linked in space and time. Some predictions of ART are confirmed by psychophysical and neurophysiological data. (...) [Barlow; Shepard]. (shrink)

We question the ecological plausibility as a general model of cognition of van der Velde's & de Kamps's combinatorial blackboard architecture, where knowledge-binding in space and time relies on the structural rules of language. Evidence against their view of the brain and an ecologically plausible, alternative model of cognition are brought forward.

Analysis of grip force signals tailored to hand and finger movement evolution and changes in grip force control during task execution provide unprecedented functional insight into somatosensory cognition. Somatosensory cognition is a basis of our ability to manipulate, move, and transform objects of the physical world around us, to recognize them on the basis of touch alone, and to grasp them with the right amount of force for lifting and manipulating them. Recent technology has permitted the wireless monitoring of grip (...) force signals recorded from biosensors in the palm of the human hand to track and trace human grip forces deployed in cognitive tasks executed under conditions of variable sensory (visual, auditory) input. Non-invasive multi-finger grip force sensor technology can be exploited to explore functional interactions between somatosensory brain mechanisms and motor control, in particular during learning a cognitive task where the planning and strategic execution of hand movements is essential. Sensorial and cognitive processes underlying manual skills and/or hand-specific (dominant versus non-dominant hand) behaviors can be studied in a variety of contexts by probing selected measurement loci in the fingers and palm of the human hand. Thousands of sensor data recorded from multiple spatial locations can be approached statistically to breathe functional sense into the forces measured under specific task constraints. Grip force patterns in individual performance profiling may reveal the evolution of grip force control as a direct result of cognitive changes during task learning. Grip forces can be functionally mapped to from-global-to-local coding principles in brain networks governing somatosensory processes for motor control in cognitive tasks leading to a specific task expertise or skill. Under the light of a comprehensive overview of recent discoveries into the functional significance of human grip force variations, perspectives for future studies in cognition, in particular the cognitive control of strategic and task relevant hand movements in complex real-world precision task, are pointed out. (shrink)

Voluntary participation is connected to cultural, political, religious and social contexts. Social and societal factors can provide opportunities, expectations and requirements for voluntary activity, as well as influence the values and norms promoting this. These contexts are especially central in the case of voluntary participation among students as they are often responding to the societal demands for building a career and qualifying for future assignments and/or government requirements for completing community service. This article questions how cultural values affect attitudes towards (...) volunteerism, using data from an empirical research project on student volunteering activity in 13 countries in North America, Europe, the Middle East, and the Asia Pacific region. The findings indicate that there are differences in motivation between countries which represent different cultural values. This article sets these findings in context by comparing structural and cultural factors which may influence volunteerism within each country. (shrink)

Au cours de son histoire, la psychologie sociale en tant que discipline s'est peu intéressée au langage et à la communication. Comme en psychologie, le point de départ de toute investigation a été tout d'abordl'individu ou le soi plutôt que l'interdépendance entre individu et autrui, ou entre ego et alter. Cet article présente la perspective selon laquelle le dialogisme peut constituer un cadre pour les études en psychologie sociale. Le dialogisme est caractérisé par la capacité de l'être humain à concevoir, (...) créer et communiquer sur les réalités sociales par rapport à autrui, c'est-à-dire par rapport à d'autres individus, d'autres groupes, des communautés et des cultures autres. Les relations dialogiques peuvent se transmettre entre générations à travers la mémoire collective, les institutions et les pratiques sociales. On suggère enfin que la théorie des représentations sociales est conçue sur l'idée de dialogisme.Throughout its history social psychology as a discipline has paid relatively little attention to language and communication. As with psychology, in social psychology the starting point of inquiry has been primarily the individual or the self rather than the interdependence between the individual and others, or between the ego and alter. This paper presents the perspective according to which dialogism can serve as a framework for the study of social psychology. Dialogism is characterized here as the capacity of the human mind to conceive, create and communicate about social realities in terms of the "Alter", i.e. in terms of another individual, groups, communities and cultures. Dialogical relations can be transmitted from generation to generation through collective memory, institutions and social practices. It is suggested that the theory of social representations can be conceived as a dialogically based theory. (shrink)

In the field theories in physics, any particular region of the presumed space-time continuum and all interactions between elementary objects therein can be objectively measured and/or accounted for mathematically. Since this does not apply to any of thefield theories, or any other neural theory, of consciousness, their explanatory power is limited. As discussed in detail herein, the matter is complicated further by the facts than any scientifically operational definition of consciousness is inevitably partial, and that the phenomenon has no spatial (...) dimensionality. Under the light of insights from research on meditation and expanded consciousness, chronic pain syndrome, healthy aging, and eudaimonic well being, we may conceive consciousness as a source of potential energy that has no clearly defined spatial dimensionality, but can produce significant changes in others and in the world, observable in terms of changes in time. It is argued that consciousness may have evolved to enable the human species to generate such changes in order to cope with unprecedented and/or unpredictable adversity. Such coping could, ultimately, include the conscious planning of our own extinction when survival on the planet is no longer an acceptable option. (shrink)

We show that true colors as defined by Chevreul (1839) produce unsuspected simultaneous brightness induction effects on their immediate grey backgrounds when these are placed on a darker (black) general background surrounding two spatially separated configurations. Assimilation and apparent contrast may occur in one and the same stimulus display. We examined the possible link between these effects and the perceived depth of the color patterns which induce them as a function of their luminance contrast. Patterns of square-shaped inducers of a (...) single color (red, green, blue, yellow, or grey) were placed on background fields of a lighter and a darker grey, presented on a darker screen. Inducers were always darker on one side of the display and brighter on the other in a given trial. The intensity of the grey backgrounds varied between trials only. This permitted generating four inducer luminance contrasts, presented in random order, for each color. Background fields were either spatially separated or consisted of a single grey field on the black screen. Experiments were run under three environmental conditions: dark-adaptation, daylight, and rod-saturation after exposure to bright light. In a first task, we measured probabilities of contrast, assimilation, and no effect in a three-alternative forced-choice procedure (background appears brighter on the ‘left’, on the ‘right’ or the ‘same’). Visual adaptation and inducer contrast had no significant influence on the induction effects produced by colored inducers. Achromatic inducers produced significantly stronger contrast effects after dark-adaptation, and significantly stronger assimilation in daylight conditions. Grouping two backgrounds into a single one was found to significantly decrease probabilities of apparent contrast. Under the same conditions, we measured probabilities of the inducers to be perceived as nearer to the observer inducers. These, as predicted by Chevreul’s law of contrast, were determined by the luminance contrast of the inducers only, with significantly higher probabilities of brighter inducers to be seen as nearer, and a marked asymmetry between effects produced by inducers of opposite sign. Implications of these findings for theories which attempt to link simultaneous induction effects to the relative depth of object surfaces in the visual field are discussed. (shrink)

The quantization error in a fixed-size Self-Organizing Map (SOM) with unsupervised winner-take-all learning has previously been used successfully to detect, in minimal computation time, highly meaningful changes across images in medical time series and in time series of satellite images. Here, the functional properties of the quantization error in SOM are explored further to show that the metric is capable of reliably discriminating between the finest differences in local contrast intensities and contrast signs. While this capability of the QE is (...) akin to functional characteristics of a specific class of retinal ganglion cells (the so-called Y-cells) in the visual systems of the primate and the cat, the sensitivity of the QE surpasses the capacity limits of human visual detection. Here, the quantization error in the SOM is found to reliably signal changes in contrast or colour when contrast information is removed from or added to the image, but not when the amount and relative weight of contrast information is constant and only the local spatial position of contrast elements in the pattern changes. While the RGB Mean reflects coarser changes in colour or contrast well enough, the SOM-QE is shown to outperform the RGB Mean in the detection of single-pixel changes in images with up to five million pixels. This could have important implications in the context of unsupervised image learning and computational building block approaches to large sets of image data (big data). (shrink)

Poorly saturated colors are closer to a pure grey than strongly saturated ones and, therefore, appear less “colorful”. Color saturation is effectively manipulated in the visual arts for balancing conflicting sensations and moods and for inducing the perception of relative distance in the pictorial plane. While perceptual science has proven quite clearly that the luminance contrast of any hue acts as a self-sufficient cue to relative depth in visual images, the role of color saturation in such figure-ground organization has remained (...) unclear. We presented configurations of colored inducers on grey ‘test’ backgrounds to human observers. Luminance and saturation of the inducers was uniform on each trial, but varied across trials. We ran two separate experimental tasks. In the relative background brightness task, perceptual judgments indicated whether the apparent brightness of the grey test background contrasted with, assimilated to, or appeared equal (no effect) to that of a comparison background with the same luminance contrast. Contrast polarity and its interaction with color saturation affected response proportions for contrast, assimilation and no effect. In the figure-ground task, perceptual judgments indicated whether the inducers appeared to lie in front of, behind, or in the same depth with the background. Strongly saturated inducers produced significantly larger proportions of foreground effects indicating that these inducers stand out as figure against the background. Weakly saturated inducers produced significantly larger proportions of background effects, indicating that these inducers are perceived as lying behind the backgrounds. We infer that color saturation modulates figure-ground organization, both directly by determining relative inducer depth, and indirectly, and in interaction with contrast polarity, by affecting apparent background brightness. The results point towards a hitherto undocumented functional role of color saturation in the genesis of form, and in particular figure-ground percepts in the absence of chromatostereopsis. (shrink)

The principle of self-organization has acquired a fundamental significance in the newly emerging field of computational philosophy. Self-organizing systems have been described in various domains in science and philosophy including physics, neuroscience, biology and medicine, ecology, and sociology. While system architecture and their general purpose may depend on domain-specific concepts and definitions, there are (at least) seven key properties of self-organization clearly identified in brain systems: 1) modular connectivity, 2) unsupervised learning, 3) adaptive ability, 4) functional resiliency, 5) functional plasticity, (...) 6) from-local-to-global functional organization, and 7) dynamic system growth. These are defined here in the light of insight from neurobiology, cognitive neuroscience and Adaptive Resonance Theory (ART), and physics to show that self-organization achieves stability and functional plasticity while minimizing structural system complexity. A specific example informed by empirical research is discussed to illustrate how modularity, adaptive learning, and dynamic network growth enable stable yet plastic somatosensory representation for human grip force control. Implications for the design of “strong” artificial intelligence in robotics are brought forward. (shrink)