Effects of endorphin blocking on conditioned SCR in humans

In order to test the hypothesis that low levels of endogenous opioids (endorphins) predispose to strong conditioning effects, female Ss (N = 36) were assigned to a placebo group, a low-dose naltrexone group, or a high-dose naltrexone group and then underwent a classical conditioning procedure. This procedure consisted of an acquisition phase in which all Ss received 5 pairings of a CS+ (neutral picture) and a UCS (100 dB white noise). The CS− (neutral picture) was never followed by a UCS. During extinction, Ss received 4 unreinforced presentations of CS+ and CS−. Throughout the experiment, skin conductance responses (SCRs) to the CSs and UCSs were recorded. Acquisition was successful in that CS+ slides elicited stronger SCRs than CS − slides. However, during acquisition, there was no interaction between drug and differential response (CS+ vs CS−). During extinction, there was no overall remaining effect of conditioning. Again, no evidence was found to suggest that (remaining) effects of conditioning were stronger in the naltrexone treated Ss than in the placebo S's. If anything, the opposite seemed to be true with especially high-dose naltrexone Ss showing relatively weak conditioning effects.     

Can We Use Social Policy to Enhance Compliance with Moral Obligations to Animals?

Those who wish to abolish or restrict the use of non-human animals in so-called factory farming and/or experimentation often argue that these animal use practices are incommensurate with animals’ moral status. If sound, these arguments would establish that, as a matter of ethics or justice, we should voluntarily abstain from the immoral animal use practices in question. But these arguments can’t and shouldn’t be taken to establish a related conclusion: that the moral status of animals justifies political intervention to disallow or significantly diminish factory farming and animal experimentation. In this paper, we set out to do two things: First, we argue that while the arguments mentioned above may establish the moral impermissibility or injustice of the practices they condemn, they are not sufficient to justify political interventions or social policies to abolish or restrict such practices. It is one thing to argue that some moral imperative or imperative of justice exists, and quite another thing to call for the use of political power to induce compliance with that imperative. Our second task is to assess the prospects for developing an argument that is sufficient to justify political interventions to restrict or abolish the use of non-human animals in factory farming or experimentation. Beyond establishing the immorality or injustice of animal consumption or experimentation, one must show that the interventions in question constitute legitimate use of political power. Would prohibiting or discouraging animal use be legitimate? We attempt to answer this question within the context of fundamental liberal constraints on the legitimate use of coercive political power.     

Developing a model of adolescent friendship formation on the internet.

Previous research has been largely silent about what precisely influences online friendship formation and has ignored motives for online communication as potential explanations. Drawing on a sample of 493 adolescents, this study tested a path model of adolescent friendship formation including as predictors introversion/extraversion, online self-disclosure, motive for social compensation, and frequency of online communication. Our path analysis showed that extraverted adolescents self-disclosed and communicated online more frequently, which, in turn, facilitated the formation of online friendships. Introverted adolescents, by contrast, were more strongly motivated to communicate online to compensate for lacking social skills. This increased their chances of making friends online. Among introverted adolescents, a stronger motive for social compensation also led to more frequent online communication and online self-disclosure, resulting in more online friendships. The model suggests that the antecedents of online friendship formation are more complex than previously assumed and that motives for online communication should be studied more closely.     

The facing bias in biological motion perception: structure, kinematics, and body parts

Depth-ambiguous point-light walkers (PLWs) elicit a facing bias: Observers perceive a PLW as facing toward them more often than as facing away (Vanrie,Dekeyser, & Verfaillie, Perception, 33, 547-560, 2004). While the facing bias correlates with the PLW's perceived gender (Brooks et al., Current Biology, 18, R728-R729, 2008; Schouten, Troje, Brooks, van der Zwan, & Verfaillie, Attention, Perception, & Psychophysics, 72,1256-1260, 2010), it remains unclear whether the change in perceived in-depth orientation is caused by a change in perceived gender. In Experiment 1, we show that structural and kinematic stimulus properties that lead to the same changes in perceived gender elicit opposite changes in perceived in-depth orientation, indicating that the relation between perceived gender and in-depth orientation is not causal. The results of Experiments 2 and 3 further suggest that the perceived in-depth orientation of PLWs is strongly affected by locally acting stimulus properties. The facing bias seems to be induced by stimulus properties in the lower part of the PLW.     

Characteristics and motives of adolescents talking with strangers on the internet.

Despite widespread concerns about the dangers of adolescents' online communication with strangers, we know little about (a) which types of adolescents talk with strangers and (b) what motivates them to do so. Drawing on a survey among 412 Dutch adolescents, we found that early adolescents (12-14-year-olds) were most prone to talk with strangers on the internet. If adolescents communicated online more frequently, they less often talked with strangers on the internet. However, if adolescents engaged in long chat sessions, they tended to talk with strangers on the internet more often. In contrast to earlier research, introversion was not related to adolescents' tendency to talk with strangers. The motives of entertainment, meeting new people, and social compensation increased adolescents' online communication with strangers.     

Philosophy in Schools: Can Early Exposure Help Solve Philosophy's Gender Problem?

In this article, I explore a new reason in favor of precollegiate philosophy: It could help narrow the persistent gender disparity within the discipline. I catalog some of the most widely endorsed explanations for the underrepresentation of women in philosophy and argue that, on each hypothesized explanation, precollegiate philosophy instruction could help improve our discipline's gender balance. Explanations I consider include stereotype threat, gendered philosophical intuitions, inhospitable disciplinary environment, lack of same‐sex role models for women students in philosophy, and conflicting “schemas” for philosophy and femininity. I argue that, insofar as some combination of these hypothesized explanations accounts for some portion of the underrepresentation of women in philosophy, those of us concerned to make things better have reason to participate in and promote efforts to share philosophy with younger students.     

Religious Values in Clinical Practice are Here to Stay

Research to date has shown that health professionals often practice according to personal values, including values based on faith, and that these values impact medicine in multiple ways. While some influence of personal values are inevitable, awareness of values is important so as to sustain beneficial practice without conflicting with the values of the patient. Detecting when own personal values, whether based on a theistic or atheistic worldview, are at work, is a daily challenge in clinical practice. Simultaneously ethical guidelines of tone-setting medical associations like American Medical Association, the British General Medical Council and Australian Medical Association have been updated to encompass physicians’ right to practice medicine in accord with deeply held beliefs. Framed by this context, we discuss the concept of value-neutrality and value-based medical practice of physicians from both a cultural and ethical perspective, and reach the conclusion that the concept of a completely value-neutral physician, free from influence of personal values and filtering out value-laden information when talking to patients, is simply an unrealistic ideal in light of existing evidence. Still we have no reason to suspect that personal values, whether religious, spiritual, atheistic or agnostic, should hinder physicians from delivering professional and patient-centered care.

     

Does Avatar Appearance Matter? How Team Visual Similarity and Member–Avatar Similarity Influence Virtual Team Performance

This multimethod study investigated how avatar appearance influences virtual team performance. This study is the first to integrate the framework of social identity model of de‐individuation effects (SIDE) and Self‐Identification theory, using “morphing” techniques. Results were obtained from a 2 (team visual similarity: dissimilar vs. similar team avatars) × 2 (member–avatar similarity: cartoon avatars vs. avatar similar to self) experiment (N = 240). The findings indicated that teams using “morphed team avatars,” which combined both a high degree of team visual similarity and member–avatar similarity in their appearances, performed best on the task, and showed greater social attraction than teams in the other conditions. Moreover, content analysis of the chat conversations revealed that these teams interacted more strategically and expressed a greater motivation to solve the task.     

Inferring intentions from biological motion: A stimulus set of point-light communicative interactions

We present the first database of communicative interactions reproduced through point-light displays (Communicative Interaction Database). The database contains 20 communicative interactions performed by male and by female couples. For each action, we provide movie files from four different viewpoints, as well as text files with the 3-D spatial coordinates of the point lights, allowing researchers to construct customized versions. By including various types of actions performed with different social motives, the database contains a diverse sample of nonconventional communicative gestures. Normative data collected to assess the recognizability of the stimuli suggest that, for most action stimuli, information in point-light displays is sufficient for clear recognition of the action as communicative, as well as for identification of the specific communicative gesture performed by the actor. The full set of stimuli may be downloaded from http://brm.psychonomic-journals.org/ content/supplemental and from http://ppw.kuleuven.be/labexppsy/lepSite/resources/CID.rar.