Using perfusion fMRI to measure continuous changes in neural activity with learning

In this study, we examine the suitability of a relatively new imaging technique, arterial spin labeled perfusion imaging, for the study of continuous, gradual changes in neural activity. Unlike BOLD imaging, the perfusion signal is stable over long time-scales, allowing for accurate assessment of continuous performance. In addition, perfusion fMRI provides an absolute measure of blood flow so signal changes can be interpreted without reference to a baseline. The task we used was the serial response time task, a sequence learning task. Our results show reliable correlations between performance improvements and decreases in blood flow in premotor cortex and the inferior parietal lobe, supporting the model that learning procedures that increase efficiency of processing will be reflected in lower metabolic needs in tissues that support such processes. More generally, our results show that perfusion fMRI may be applied to the study of mental operations that produce gradual changes in neural activity.     

The role of prefrontal cortex in resolving distractor interference

We investigate the hypothesis that those subregions of the prefrontal cortex (PFC) found to support proactive interference resolution may also support delay-spanning distractor interference resolution. Ten subjects performed delayed-recognition tasks requiring working memory for faces or shoes during functional MRI scanning. During the 15-sec delay interval, task-irrelevant distractors were presented. These distractors were either all faces or all shoes and were thus either congruent or incongruent with the domain of items in the working memory task. Delayed-recognition performance was slower and less accurate during congruent than during incongruent trials. Our fMRI analyses revealed significant delay interval activity for face and shoe working memory tasks within both dorsal and ventral PFC. However, only ventral PFC activity was modulated by distractor category, with greater activity for congruent than for incongruent trials. Importantly, this congruency effect was only present for correct trials. In addition to PFC, activity within the fusiform face area was investigated. During face distraction, activity was greater for face relative to shoe working memory. As in ventrolateral PFC, this congruency effect was only present for correct trials. These results suggest that the ventrolateral PFC and fusiform face area may work together to support delay-spanning interference resolution.     

Examining the personal-professional distinction: ethics codes and the difficulty of drawing a boundary

The Ethics Code of the American Psychological Association (APA) applies to the professional role behaviors of members and not to their personal behavior. This article discusses some of the difficulties inherent in drawing distinctions between the personal and the professional. Consideration is given to the importance of clarifying public statements. Four ethics codes other than the APA Ethics Code are examined for how they treat the personal-professional distinction. A number of questions are posed to assist in determining the tilt a behavior takes. A concluding recommendation suggests that APA Ethical Standards be applied only to professional role behaviors, whereas aspirational principles might be applied to personal behavior.     

Why do Managers Engage in Trustworthy Behavior? A Multilevel Cross‐Cultural Study in 18 Countries

Drawing on theories of generalized exchange and the norm of indirect reciprocity, we conceptualize subordinates’ organizational citizenship behavior directed toward the organization (OCBO) and directed toward peers (OCBI) as antecedents of managerial trustworthy behavior and examine how managers’ affective trust in subordinates mediates this relationship. We also investigate the extent to which this mediation is moderated by the level of collectivism in a society. Data were collected from 741 managers and 2,111 subordinates in 18 countries representing all major cultural regions of the world. We find support for our hypothesized moderated mediation in that managers’ affective trust in subordinates mediates the relationships between both subordinates’ OCBO and managerial trustworthy behavior, and subordinates’ OCBI and managerial trustworthy behavior across the different countries studied. Further, managers’ affective trust in subordinates only mediates the relationships between both types of citizenship behavior and managerial trustworthy behavior when collectivism is low to medium but not when it is high. Implications for research on cross‐cultural psychology, trust, and organizational citizenship behavior are discussed.     

Cognitive effects of hormone therapy in early postmenopausal women

Recent reports suggest that hormone therapy (HT) with estrogen may have a protective effect on the ageing brain and cognitive function. However, clinical evidence regarding the cognitive effects in menopausal women under HT has produced conflicting results. The purpose of the present study was to assess and compare the cognitive effects after 6 months of HT in 30 early postmenopausal women, who were divided into three groups as follows: group I, Therapy conjugated equine estrogen (ET) CEE 0.625 mg/day (n = 10); group II, Estrogen‐Progestin Therapy (EPT), CEE 0.625 mg/day plus, chlormadinone 1 mg/day (n = 10); and group III, the control group, who did not receive treatment (n = 10). The three groups were matched by age and years of education. Exclusion criteria were: central nervous system diseases, severe cardiac disease, and clinical history of cancer and depression. Subjects were tested using a comprehensive battery for the evaluation of attention, memory and executive functions, which was standardized and validated in Spanish‐speaking subjects. The rate of cognitive change was defined by the difference between the measurements at the sixth month minus the baseline score. Mean group differences were assessed with MANOVA, followed by one‐way ANOVA considering statistical significance when p < .05; the alpha significance level .05 was corrected using the Bonferroni procedure. The EPT group showed higher scores than the control group and ET group in the Total Attention Score and in the copy of the Rey‐Osterreith Complex Figure. The ET group showed significantly higher scores than the control group and the EPT group in the subtest of Spatial Backward Span and in the Immediate Face Codification. The short‐term positive effects observed with HT in this sample could be related to the stimulation of brain receptors and/or neurotrophic factors that are still present at this age.     

Ecological Correlates of Family Functioning

Guided by ecological theory, we empirically explored how parents' psychological functioning, social relationships, and demographic characteristics related to family functioning. Our sample of 197 participants included both neglectful and control families. We found statistically significant associations between the predictor variables (i.e., maternal personal maturity, depression, stressful life events, social support, family of origin difficulties, education, income) and family functioning as rated by mothers, caseworkers familiar with the families, and observers who coded family interaction tasks. However, the exact pattern of significant associations differed as a function the rater of family health.     

An evaluation of the cross‐national generalizability of organizational commitment

Using data from two large multinational samples, this research sought to contribute to our knowledge of international organizational behaviour by examining the cross‐national generalizability of organizational commitment. Sample 1 included employees of 10 subsidiaries of a large multinational organization, whereas Sample 2 relied on data collected in 25 nations in the context of a large opinion survey. Results in both samples supported the expectation that measures of commitment would be more susceptible to measurement non‐equivalence than measures of job satisfaction. Differences in relationships between commitment and satisfaction across countries were observed in both samples, as were differences in mean commitment levels. Nation‐level individualism/collectivism (I/C) failed to account for the observed differences, however, suggesting that commitment and I/C are largely independent, despite theoretical arguments to the contrary. Results of the study suggest that despite some cross‐national variation, differences in commitment across national boundaries are small and empirically unrelated to I/C.     

Psychological support post-release of humanitarian workers taken hostage: the experience of the International Committee of the Red Cross (ICRC)

ABSTRACT

Following release, former hostages face many challenges and may struggle to regain control over their lives. Research and evidence on how to effectively address the needs of hostages during their release and afterwards is lacking. The International Committee of the Red Cross has extensive experience in managing hostage situations and has strengthened the practice of care offered to its own affected staff by developing an inter-professional comprehensive seven phase care model adapted to incidents of extended duration with multiple stressors. This includes strong coordination between the different actors involved, combined with long-term peer, social and organisational support, as well as workplace reintegration with guidance by colleagues, and specialised counselling when necessary, to ensure positive outcomes, and minimise permanent sequelae.