Enhanced proliferation of progenitor cells following long-term potentiation induction in the rat dentate gyrus

The dentate gyrus (DG) is among the few areas in the mammalian brain where production of new neurons continues in the adulthood. Although its functional significance is not completely understood, several lines of evidence suggest the role of DG neurogenesis in learning and memory. Considering that long-term potentiation (LTP) is a prime candidate for the process underlying hippocampal learning and memory, these results raise the possibility that LTP and neurogenesis are closely related. Here, we investigated whether or not LTP induction in the afferent pathway triggers enhanced proliferation of progenitor cells in the DG. LTP was induced by tetanic stimulation in perforant path-DG synapses in one hemisphere, and the number of newly generated progenitor (BrdU-labeled) cells in the DG was quantified. Compared with the control hemisphere (stimulated with low-frequency pulses), the LTP-induced hemisphere contained a significantly higher number of newly generated progenitor cells in the dorsal as well as ventral DG. When CPP, an NMDA receptor antagonist, was administered, tetanic stimulation neither induced LTP nor enhanced progenitor cell proliferation, indicating that NMDA receptor activation, rather than tetanic stimulation per se, is responsible for enhanced progenitor proliferation in the control animal. Our results show that tetanic stimulation of perforant path sufficient to induce LTP increases progenitor proliferation in adult DG in an NMDA receptor-dependent manner.     

Ethical considerations of integrating spiritual direction into psychotherapy

Integrating spirituality and religion into clinical practice or psychotherapy has become a significant area of interest in the mental health field today. This article focuses more specifically on integrating spiritual direction into psychotherapy, discusses ethical issues involved, and suggests ethical guidelines for the appropriate and helpful use of spiritual direction in the context of psychotherapy and counseling.     

Comparability of Self‐Reported Conscientiousness Across 21 Countries

In cross‐national studies, mean levels of self‐reported phenomena are often not congruent with more objective criteria. One prominent explanation for such findings is that people make self‐report judgements in relation to culture‐specific standards (often called the reference group effect), thereby undermining the cross‐cultural comparability of the judgements. We employed a simple method called anchoring vignettes in order to test whether people from 21 different countries have varying standards for Conscientiousness, a Big Five personality trait that has repeatedly shown unexpected nation‐level relationships with external criteria. Participants rated their own Conscientiousness and that of 30 hypothetical persons portrayed in short vignettes. The latter type of ratings was expected to reveal individual differences in standards of Conscientiousness. The vignettes were rated relatively similarly in all countries, suggesting no substantial culture‐related differences in standards for Conscientiousness. Controlling for the small differences in standards did not substantially change the rankings of countries on mean self‐ratings or the predictive validities of these rankings for objective criteria. These findings are not consistent with mean self‐rated Conscientiousness scores being influenced by culture‐specific standards. The technique of anchoring vignettes can be used in various types of studies to assess the potentially confounding effects of reference levels. Copyright © 2011 John Wiley & Sons, Ltd.     

Effects of Diversity on Knowledge Sharing and Creativity of Work Teams: Status Differential Among Members as a Facilitator

ABSTRACT

We investigated a plausible intermediate process and a boundary condition that elaborates the diversity–team creativity relationship to address mixed findings on the relationship between diversity and creativity. Our analysis using multi-source data collected from 128 work groups showed that age diversity and functional background diversity had negative and positive effects, respectively, on knowledge sharing and subsequent team creativity. Moreover, the effects of the four diversity attributes (age, gender, functional background, and tenure) on knowledge sharing were all negative in groups with low status differential, whereas the same effects became significantly positive in groups with high status differential. This study demonstrates a mechanism through which group diversity facilitates team creativity based on the information processing view of diversity and the functional approach to social status.     

Do Online Comments Influence the Public's Attitudes Toward an Organization? Effects of Online Comments Based on Individuals’ Prior Attitudes

The authors investigated the effects of reading different types of online comments about a company on people's attitude change based on individual's prior attitude toward the company. Based on Social Judgment Theory, several hypotheses were tested. The results showed that the effects of online comments interact with individuals’ prior attitudes toward a corporation. People with a strong negative attitude toward a corporation were less influenced by other's online comments than people with a neutral attitude in general. However, people with a prior negative attitude were more affected by refutational two-sided comments than one-sided comments. The results suggest that the effects of user generated content should be studied in a holistic manner, not only by investigating the effects of online content itself, but also by examining how others’ responses to the content shape or change individuals’ attitudes based on their prior attitudes.     

Judging Faces in Context

Previous judgment studies of facial expressions of emotion in context have provided mixed results. These contradictory findings arise, in part, because of a lack of consideration of the different aspects of context with which facial expressions of emotion can be combined, and different meanings of face-context pairings vis-à-vis real-life phenomena. In this paper, we provide a framework of how faces and contexts combine and describe possible meanings of consistent and inconsistent face-context pairings. We also discuss methodological caveats that should be considered in the conduct of such judgment studies. We argue that future research in this area will benefit not from more studies of different combinations of stimuli created merely because we have the technological ability to create them, but instead from careful consideration of the ecological validity of the various types of combinations that can be produced, and their meaning.