Touchant-touché: the role of self-touch in the representation of body structure

The "body image" is a putative mental representation of one's own body, including structural and geometric details, as well as the more familiar visual and affective aspects. Very little research has investigated how we learn the structure of our own body, with most researchers emphasising the canonical visual representation of the body when we look at ourselves in a mirror. Here, we used non-visual self-touch in healthy participants to investigate the possibility that primary sensorimotor experience may influence cognitive representations of one's own body structure. Participants used the fingers of one hand (the 'active' hand), to touch the fingers of the other (the 'passive' hand). A conflict between the experience of the active and passive hand was introduced by experimenter interleaving their fingers with the fingers of the participant's passive hand. This led to the active hand experiencing that it touched more fingers than the passive hand felt it was being touched by. The effects on representation of body structure were assessed using an implicit measure based on Kinsbourne and Warrington's 'in-between task'. We found an underestimation of the number of fingers in the central part of the hand specifically linked to the experience of self-touch. This pattern of results corresponds to the experience of the passive hand, but not the active hand. Nevertheless, comparable reorganisation of fingers within the hand representation was found for both active and passive hands. We show that primary sensorimotor experience can modify the representation of body structure. This modification is driven by the passive experience of being touched, rather than by the active experience of touching. We believe this is the first experimental study of effects of self-touch on the mental representation of the body.     

Imagining the Future of Photoacoustic Mammography

How can a realistic ethical imagination about the future of a technology take shape? This article contains a reflection which is based on the experiences of an embedded ethicist in the context of biophysical research conducive to the development of photoacoustic mammography, which is intended for the non-invasive detection of breast cancer. Imagination in this context already informs the activities of the biophysical researchers, but its role is limited: biophysical future scenarios concentrate on the technological advances that photoacoustics could bring about. In this article it is argued that it is advisable to also consider the medical practice and the ways in which this practice is likely to change as an effect of the introduction of photoacoustic mammography into it. On the basis of this more encompassing imaginative endeavor it is possible to get a clearer idea about how new technologies are able to contribute to human well being, which is informative for the setting of research-goals/priorities and a responsible implementation of new technologies into the world.     

Forest chimpanzees (Pan troglodytes verus) remember the location of numerous fruit trees

It is assumed that spatial memory contributes crucially to animal cognition since animals’ habitats entail a large number of dispersed and unpredictable food sources. Spatial memory has been investigated under controlled conditions, with different species showing and different conditions leading to varying performance levels. However, the number of food sources investigated is very low compared to what exists under natural conditions, where food resources are so abundant that it is difficult to precisely identify what is available. By using a detailed botanical map containing over 12,499 trees known to be used by the Taï chimpanzees, we created virtual maps of all productive fruit trees to simulate potential strategies used by wild chimpanzees to reach resources without spatial memory. First, we simulated different assumptions concerning the chimpanzees’ preference for a particular tree species, and, second, we varied the detection field to control for the possible use of smell to detect fruiting trees. For all these assumptions, we compared simulated distance travelled, frequencies of trees visited, and revisit rates with what we actually observed in wild chimpanzees. Our results show that chimpanzees visit rare tree species more frequently, travel shorter distances to reach them, and revisit the same trees more often than if they had no spatial memory. In addition, we demonstrate that chimpanzees travel longer distances to reach resources where they will eat for longer periods of time, and revisit resources more frequently where they ate for a long period of time during their first visit. Therefore, this study shows that forest chimpanzees possess a precise spatial memory which allows them to remember the location of numerous resources and use this information to select the most attractive resources.     

Prospective coding in event representation

A perceived event such as a visual stimulus in the external world and a to-be-produced event such as an intentional action are subserved by event representations. Event representations do not only contain information about present states but also about past and future states. Here we focus on the role of representing future states in event perception and generation (i.e., prospective coding). Relevant theoretical issues and paradigms are discussed. We suggest that the predictive power of the motor system may be exploited for prospective coding not only in producing but also in perceiving events. Predicting is more advantageous than simply reacting. Perceptual prediction allows us to select appropriate responses ahead of the realization of an (anticipated) event and therefore, it is indispensable to flexibly and timely adapt to new situations and thus, successfully interact with our physical and social environment.     

Psychologists' perceptions of their duty to protect uninformed sex partners of HIV-positive clients.

The purpose of the present study was to determine whether mental health professionals would breach the confidentiality of HIV-infected patients with uninformed sex partners, and how any such disclosure would occur. Subjects read one of eight vignettes that depicted a patient who refused to disclose his viral status. Results revealed a split of opinion about breaching confidentiality and about the preferred mode for doing so. Neither diagnosis nor mode of viral transmission significantly influenced breaching decisions. Subjects demonstrated a high level of AIDS risk knowledge but only a moderate level of legal/ethical knowledge. Implications of these findings are discussed.     

The Performance of Pre‐Founding Entrepreneurial Teams: The Importance of Learning and Leadership

Entrepreneurial teams often struggle with simultaneous task and team challenges at an early stage of new venture creation. The way in which teams shape their teamwork is key in leveraging performance in the pre‐founding phase. Learning should help the team in establishing good teamwork and in expanding its members’ entrepreneurial capabilities. Leadership is needed to facilitate and guide this learning. Accordingly, we investigated learning and leadership as facilitators of performance in the pre‐founding phase. Specifically, we examined team reflexivity as a collective internal learning process and boundary spanning behaviour as an externally directed individual activity, operating at different levels in fostering team and individual performance. Charismatic team leadership was examined as a catalyst of learning, shaping team and individual performance ultimately. The multilevel mediation model was tested based on data from 196 members of 58 teams of a venture creation programme. Team reflexivity predicted team and individual performance. Boundary spanning behaviour was not related to performance. As hypothesised, charismatic team leadership predicted team and individual performance, both mediated by team reflexivity. This research highlights the relevance of team learning in pre‐founding teams and emphasises leadership in shaping learning and moving new ventures forward.     

The countable homogeneous universal model of B 2

We give a detailed account of the Algebraically Closed and Existentially Closed members of the second Lee class B ₂ of distributive p-algebras, culminating in an explicit construction of the countable homogeneous universal model of B ₂. The axioms of Schmid [7], [8] for the AC and EC members of B ₂ are reduced to what we prove to be an irredundant set of axioms. The central tools used in this study are the strong duality of Clark and Davey [3] for B ₂ and the method of Clark [2] for constructing AC and EC algebras using a strong duality. Applied to B ₂, this method transfers the entire discussion into an equivalent dual category X ₂ of Boolean spaces which carry a pair of tightly interacting orderings. The doubly ordered spaces of X ₂ prove to be much more readily constructed and analyzed than the corresponding algebras in B ₂.     

Attributions for dietary failures: problems reported by participants in the Hypertension Prevention Trial

Assigned participants in the Hypertension Prevention Trial to one of four diets for a period of 3 years: (a) weight loss, (b) reduced sodium, (c) weight loss plus reduced sodium, and (d) reduced sodium plus increased potassium. At 6-month intervals, they reported problems they were having adhering to their diets. Problem attributions were coded along the dimensions of internality, stability, and controllability and were categorized as intrapersonal or extrapersonal. Attributions were found to differ by type of diet and sex of participant. Participants assigned to weight-loss groups were significantly more likely than those assigned to non-weight-loss groups to blame themselves for their problems with adherence, making characterological as opposed to external or situational attributions. Men perceived problems to be more controllable than women. Attributions did not predict weight loss, change in urinary sodium, or change in potassium excretion.