Cathodal tDCS of the Left Posterior Parietal Cortex Increases Proprioceptive Drift

In aiming movements the limb position drifts away from the defined target after some trials without visual feedback, a phenomenon defined as proprioceptive drift (PD). There are no studies investigating the association between the posterior parietal cortex (PPC) and PD in aiming movements. Therefore, cathodal and sham transcranial direct current stimulation (tDCS) were applied to the left PPC concomitantly with the performance of movements with or without vision. Cathodal tDCS applied without vision produced a higher level of PD and higher rates of drift accumulation while it decreased peak velocity and maintained the number of error corrections, not affecting movement amplitude. The proprioceptive information seems to produce an effective reference to movement, but with PPC stimulation it causes a negative impact on position.     

The Short Dark Triad (SD3): Adaptation and Psychometrics among At-Risk Male and Female Youths

The dark triad is a term used to describe a constellation of three socially harmful personality traits: Machiavellianism, psychopathy, and narcissism. The main aim of the present study was to examine the psychometric properties of the Short Dark Triad (SD3) scale, a brief measure of the dark triad, among a sample (N = 412) of male (n = 200) and female (n = 212) at-risk Portuguese youths. Confirmatory factor analysis revealed the three-factor structure of the SD3 obtained an adequate fit, and measurement invariance across gender was demonstrated, although two items per dimension had to be removed. The Portuguese version of the SD3 scale demonstrated satisfactory psychometric properties, specifically the properties of internal consistency, convergent validity, discriminant validity, and known-groups validity, which overall justifies its use among this population. Findings are discussed in terms of the use of the SD3 scale with male and female at-risk youths.     

Addressing Unintended Consequences of Gender Diversity Interventions on Women’s Sense of Belonging in STEM

Sex Roles - Validated interventions that increase bias literacy (i.e., knowledge of gender bias) and decrease sexism are critical to addressing pervasive gender biases in science, technology,...     

Does impulsivity relate to perceived dependence on and actual use of the mobile phone?

Several authors have studied the risks arising from the growth in mobile phone use (e.g. large debts incurred by young people, banned or dangerous use of cellular phones). The aim of this study is to analyse whether impulsivity, which has often been related to various forms of addictive behaviours, is associated with massive use of and dependence on the mobile phone. In this study, 108 female undergraduate psychology students were screened using a questionnaire evaluating actual use of and perceived dependence on the mobile phone, and with the French adaptation of the UPPS Impulsive Behavior Scale. This scale identifies four distinct components associated with impulsive behaviour: Urgency, lack of Premeditation, lack of Perseverance, and Sensation Seeking. The results showed that a relationship can be established between the use of and perceived dependence on the cellular phone and two facets of impulsivity: Urgency and lack of Perseverance. Copyright © 2006 John Wiley & Sons, Ltd.     

Metacognition and metarepresentation: is a self-directed theory of mind a precondition for metacognition?

Metacognition is often defined as thinking about thinking. It is exemplified in all the activities through which one tries to predict and evaluate one’s own mental dispositions, states and properties for their cognitive adequacy. This article discusses the view that metacognition has metarepresentational structure. Properties such as causal contiguity, epistemic transparency and procedural reflexivity are present in metacognition but missing in metarepresentation, while open-ended recursivity and inferential promiscuity only occur in metarepresentation. It is concluded that, although metarepresentations can redescribe metacognitive contents, metacognition and metarepresentation are functionally distinct.     

"Trust me...": psychological and behavioral predictors of perceived physician empathy

A sociocognitive model of distal and proximal predictors of empathic judgments was tested among 100 physicians. The authors hypothesized that physician perceived control would affect empathy ratings via physician communication style. Specifically, physicians with high perceived control would use more open communication and be rated as more empathic. Physicians with low perceived control would use a controlling communication style and be rated as less empathic. Physicians completed a medical attribution questionnaire prior to a structured patient consultation exercise, during which patients and assessors rated physician empathy. The exercise was audiotaped, transcribed, and content analyzed for verbal behaviors. Support was found for the hypotheses; however, patients, but not medical assessors, associated empathy with reassurance and provision of medical information.     

Early childhood experiences and current emotional distress: what do they tell us about aspiring psychologists?

Motivation underlying the career choice of mental health professionals may include a desire to resolve personal psychological distress from childhood or the need to continue the caretaking role held in the family (A. DiCaccavo, 2002; J. D. Guy, 1987). The authors examined whether psychology students whose future vocational aspirations lie in the clinical domain (N = 40) differed from psychology students with no clinical aspirations (N = 35) and from business students (N = 91) in reported childhood experiences and current psychological functioning. Psychology students who wanted to work in the clinical domain reported higher rates of perceived childhood sexual abuse and neglect as compared with both psychology students with no clinical aspirations and business students. They also reported more parentification experiences between the ages of 14 years and 16 years as compared with business students. There were no significant differences between groups in reported levels of current negative emotions.     

Exposure to acute physical and psychological stress alters the response of rat macrophages to corticosterone, neuropeptide Y and beta-endorphin

The objective of the present study was to investigate the effect of acute exposure to electric tail shock stress (ES) and a stress witnessing procedure (SW), as models for physical and psychological stress paradigms, respectively on adherence, phagocytosis and hydrogen peroxide (H(2)O(2)) release from rat peritoneal macrophages. In addition, we studied the in vitro effects of corticosterone (CORT), neuropeptide Y (NPY) and beta-endorphin (BE) on adherence, phagocytosis and H(2)O(2) release from macrophages isolated from control rats and from rats that had been exposed to ES or SW procedures 24 h earlier. ES and SW comparably diminished phagocytosis and H(2)O(2) release, but did not influence macrophage adherence. In vitro treatment with CORT and NPY notably suppressed phagocytosis and potentiated H(2)O(2) release from macrophages. BE suppressed both phagocytosis and H(2)O(2) release from macrophages. Previous exposure to ES and SW altered the responsiveness of the isolated macrophages to their in vitro treatment with mediators of stress, making the cells less sensitive to the influence of CORT and NPY and to a lesser extent to BE. It could be concluded that changes in the local macrophage milieu induced by ES and SW 24 h earlier modify macrophage responses to subsequent in vitro exposure to the stress mimics, CORT, NPY and BE.     

Processing of biological motion point-light displays by baboons (Papio papio)

Humans apply complex conceptual judgments to point-light displays (PLDs) representing biological motion (BM), but how animals process this kind of display remains uncertain. Four baboons (Papio papio) were trained to discriminate BM from nonbiological motion PLDs using an operant computerized test system. Transfer tests were given after training with novel BM stimuli representing humans or baboons (Experiment 1), with inverted PLDs (Experiment 2), and with BM stimuli in which body parts had been spatially disorganized (Experiment 3). Very limited transfer was obtained with the novel and inverted displays in Experiments 1 and 2, but transfer was much higher after spatial disorganization in Experiment 3. It is suggested that the baboons did not retrieve and interpret the articulated shape of the human or monkey body from the BM PLD stimuli, but rather focused their attention on the configural properties of subparts of the stimuli. Limits in perceptual grouping and restricted abilities in picture-object equivalence might explain why the baboons did not map BM PLD displays onto what they represent.