Few qualitative studies explore the phenomenon of positive ethical climate and what actions are perceived as promoting it. Therefore, the aim of this study was to explore and describe actions that acute care ward nurses perceive as promoting a positive ethical climate. The critical incident technique was used. Interviews were conducted with 20 nurses at wards where the ethical climate was considered positive, according to a previous study. Meeting the needs of patients and next of kin in a considerate way, (...) as well as receiving and giving support and information within the work group, promoted a positive ethical climate. Likewise, working as a team with a standard for behaviour within the work group promoted a positive ethical climate. Future research should investigate other conditions that might also promote a positive ethical climate. (shrink)

This article discusses the reasons why illusory contours are likely to result from adaptive perceptual mechanisms that have evolved across species to promote behavioral success.

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)

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)

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)

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 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)

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)

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)

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)

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)

How the visual systems of different species enable them to detect and discriminate colour patterns and how such visual abilities contribute to their survival is discussed. The influence of evolutionary and environmental pressures on both perceptual capacity and colour trait production is to be considered. Visual systems with different functional anatomy have evolved in response to such pressures.

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.

The heuristic value of Pylyshyn's cognitive impenetrability theory is questioned in this commentary, mainly because, as it stands, the key argument cannot be challenged empirically. Pylyshyn requires unambiguous evidence for an effect of cognitive states on early perceptual mechanisms, which is impossible to provide because we can only infer what might happen at these earlier levels of processing on the basis of evidence collected at the post-perceptual stage. Furthermore, the theory that early visual processes cannot be modified by cognitive states (...) implies that it is totally pointless to try to investigate interactions between consciousness and neurosensory processes. (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.

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.

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)

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)

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 original publication, the article title has been published incorrectly. Now the same has been corrected in this correction.

This is a response to a short communication on our research presented in Solbrække et al. (Med Health Care Philos 20(1):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 (Med Health (...) Care Philos 21(2):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)

Ethics committees in Catholic health care are responsible for con­sultation, education, and policy development and review. Historically, ethics committees were reactive and had no articulated goals. This article argues that the essential goals of Catholic ethics committees are (1) to promote the human dignity of patients and staff; (2) to promote the common good; (3) to promote institutional identity, integrity, and ethical climate; and (4) to improve quality of care. These goals are most effectively met when ethics committees are proactive (...) and integrated in the institution, embrace systems thinking, and utilize professional ethicists locally or regionally. (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)

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)

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