Domestic dogs’ (Canis familiaris) choices in reference to agreement among human informants on location of food

When interacting with others, informants may offer conflicting information or information of varying accuracy. Recent research suggests that young children do not trust all informants equally and are selective in both whom they solicit for information and whose claims they support. We explored whether domestic dogs (Canis familiaris) are similarly sensitive to agreement among informants. To this end, we utilized a common human gesture, pointing, to which recent research suggests dogs are sensitive. We conducted two experiments in which an experimenter secretly hid food in one of two clear containers while the dog was distracted. Next, a small group moved to indicate the food's location using stationary points positioned above the containers. In Experiment 1, two experimenters moved to stand behind the non-baited container, while a third experimenter moved to stand behind the baited container. Then, all directed one static point at the container in front of them. Experiment 2 exactly resembled Experiment 1 with the exception that the single experimenter standing behind the baited container directed two static points at the container (one with each hand). Dogs chose the container indicated by the majority in Experiment 1 significantly more often than chance, but chose the container indicated by the minority in Experiment 2 significantly more often than chance. This suggests that the number of points, not the number of people, more strongly influenced dogs' choices.     

Benefits of regular aerobic exercise for executive functioning in healthy populations

Research suggests that regular aerobic exercise has the potential to improve executive functioning, even in healthy populations. The purpose of this review is to elucidate which components of executive functioning benefit from such exercise in healthy populations. In light of the developmental time course of executive functions, we consider separately children, young adults, and older adults. Data to date from studies of aging provide strong evidence of exercise-linked benefits related to task switching, selective attention, inhibition of prepotent responses, and working memory capacity; furthermore, cross-sectional fitness data suggest that working memory updating could potentially benefit as well. In young adults, working memory updating is the main executive function shown to benefit from regular exercise, but cross-sectional data further suggest that task-switching and posterror performance may also benefit. In children, working memory capacity has been shown to benefit, and cross-sectional data suggest potential benefits for selective attention and inhibitory control. Although more research investigating exercise-related benefits for specific components of executive functioning is clearly needed in young adults and children, when considered across the age groups, ample evidence indicates that regular engagement in aerobic exercise can provide a simple means for healthy people to optimize a range of executive functions.     

It's All in the Mind: PETTLEP-Based Imagery and Sports Performance

Two studies examined the effects of PETTLEP-based imagery compared to more traditional imagery interventions. PETTLEP imagery aims to produce a realistic and more functionally equivalent imagery experience than traditional imagery methods through factors such as wearing the correct clothing or imaging in the correct environment. In Study 1, 48 varsity hockey players were divided into four groups: “Sport-specific” imagery, “clothing” imagery, “traditional” imagery, and control. Imagery participants imaged 10 penalty flicks daily for six weeks, and controls spent an equivalent time reading hockey literature. In the post-test, the sport-specific group scored significantly higher than the clothing group, who scored significantly higher than the traditional imagery group. In Study 2, 40 junior gymnasts attempted a turning jump on the beam. They were split into four groups: A physical practice group, a PETTLEP imagery group, a stimulus only imagery group, and a control (stretching) group. Each group performed their task three times per week for six weeks. Both the physical practice and PETTLEP groups improved significantly from pre-test to post-test, with no significant difference between them, but the stimulus and control groups did not improve significantly. Taken together the results from Study 1 and 2 provide support for the efficacy of PETTLEP-based imagery over more traditional imagery interventions.     

Factors Associated with Psychological Distress among Women of African Descent at High Risk for BRCA Mutations

Little is known about psychological distress among women of African descent who are at high risk for a BRCA mutation. This is a group for whom breast cancer risk reduction is critical due to the group’s high rates of breast cancer mortality. Distress is important to consider as it may reduce the potential benefit of genetic counseling and negatively affect decision making related to risk reduction. The goals of the current study were to examine breast cancer-specific distress and depressive symptoms in women of African descent at who are at high risk for a BRCA mutation and to identify background factors associated with these outcomes. Participants were 148 high-risk African American and Caribbean women who were part of a larger study that offered participants BRCA counseling at no cost. Participants completed the Impact of Events Scale, which assessed breast cancer-specific distress, and the Center of Epidemiological Studies-Depression Scale, which assessed depressive symptoms. Results of analyses revealed that almost half of the sample achieved scores indicating high and clinically significant breast cancer-specific distress, while almost one-third had clinically significant depression scores. Results further showed that low income was significantly associated with cancer-specific distress, while having a cancer diagnosis was significantly associated with depressive symptoms. These results underscore the need for targeted psychological support throughout the genetic risk assessment process for this particular high-risk group.     

The Prevalence of Coping Behaviour,Posttraumatic Growth and Psychological Well-Being in Women who Experienced Childhood Sexual Abuse

This study investigated the prevalence of coping behaviour, posttraumatic growth and psychological well-being in adult South African women (n=60, mean age=32, ethnicity=70% European, 28% African and 2% Asian descent). Specifically, the study considered the prevalence of constructive coping, posttraumatic growth and psychological well-being with a history of childhood sexual abuse. All participants self-reported being sexually abused before the age of 18 years. They completed measures of coping, posttraumatic growth, and psychological well-being, in a cross-sectional survey design. Results showed moderate to high correlations among scales indicating conceptual coherence as indicators of constructive coping, posttraumatic growth and psychological wellness. About 58% of participants manifested constructive coping, 60% manifested posttraumatic growth, and 42% manifested psychological well-being. These women survivors of childhood sexual abuse had higher levels of posttraumatic growth than reported in previous studies.     

The DRD4 VNTR polymorphism moderates craving after alcohol consumption.

Recent research has suggested that alterations in mesolimbic dopamine neurotransmission are central to the development and expression of craving for alcohol. Because the D4 dopamine receptor gene, variable numbers of tandem repeats (DRD4 VNTR) polymorphism putatively expresses functional differences in dopamine receptors, the present study tested whether this polymorphism influences the effects of a priming dose of alcohol on craving. Participants consumed 3 alcoholic drinks or 3 control drinks and completed measures of craving after each drink. Participants who were homozygous or heterozygous for the 7 (or longer) repeat allele were classified as DRD4 L, whereas the other participants were classified as DRD4 S. Results suggested that DRD4 L participants demonstrated significantly higher craving after consumption of alcohol as compared with the control beverage.     

Public Opinion and Political Philosophy: The Relation between Social-Scientific and Philosophical Analyses of Distributive Justice

This paper considers the relation between philosophical discussions of, and social-scientific research into popular beliefs about, distributive justice. The first part sets out the differences and tensions between the two perspectives, identifying considerations which tend to lead adherents of each discipline to regard the other as irrelevant to its concerns. The second discusses four reasons why social scientists might benefit from philosophy: problems in identifying inconsistency, the fact that non-justice considerations might underlie distributive judgments, the way in which different principles of justice can yield the same concrete distributive judgments, and the ambiguity of key terms. The third part distinguishes and evaluates three versions of the claim that normative theorising about justice can profit from empirical research into public opinion: that its findings are food for thought, that they amount to feasibility constraints, and that they are constitutive of normatively justified principles of justice. The view that popular opinion about justice has a strongly constitutive role to play in justifying principles of distributive justice stricto sensu is rejected, but it is argued that what the people think (and what they can reasonably be expected to come to think) on distributive matters can be an important factor for the political theorist to take into account, for reasons of legitimacy, or feasibility, or both.     

Tympanic thermometry: an index of hemispheric activity

This article describes the use of tympanic thermometry in investigations of hemispheric specialization. Subjects were asked to perform tasks known to be performed preferentially by the right or left hemisphere while fluctuations in tympanic temperature (reflecting changes in hemispheric metabolic activity) were recorded from thermal sensors placed in their outer ear canals. The analyses show that subjects who evince relatively higher elevations in metabolic activity (as measured through tympanic thermometry) in the hemisphere specialized for the task obtain better performance scores than those who show a reversed bias.     

Perceptions of parental relationships in the eating disorders: the relevance of depressed mood

Recent studies have suggested that subtypes of eating-disordered persons differ in their perceptions of their family environments. This study used Benjamin's (1983) Structural Analysis of Social Behavior to examine how depressed mood influenced eating-disordered subjects' ratings of their parental relationships. The results indicated that when level of mood disturbance was statistically controlled, there were no significant differences in parent ratings among restricting anorexics, bulimic-anorexics, bulimics, and normal control subjects. The results are discussed in terms of the possible relations of mood, eating disorder, and perception of family relationships.     

Jury simulation studies: To exclude or not to exclude participants based on a lack of comprehension of the case?

Jury simulation research has been the subject of longstanding criticism in regards to ecological validity. One additional factor that has received little attention that may also impact the generalizability of this research relates to excluding participants based on their memory of, or their attention paid to, the case. In order to determine how common this exclusion is, the authors conducted a scoping review of jury simulation studies within the last 10 years across three major legal psychology journals. The review revealed variability in if and how studies excluded on the basis of poor attention or for failing manipulation or general memory checks. In addition, studies that did exclude on this basis varied greatly in the proportion of the sample that was excluded. Recommendations are provided in order to assist jury researchers in future with how best to manage exclusions on the basis of juror memory and attention.