In Vivo Hippocampal Acetylcholine Release During Exposure to Acute Stress

Hippocampal extracellular acetylcholine (ACh) and choline levels were evaluated using in vivo microdialysis in male Fischer 344 rats before, during, and following an 80-min exposure to two different stress conditions. Measurements were taken in rats restrained and immersed in a water bath containing either 37 degreesC (normothermic-restraint) or 20 degreesC (cold-restraint) water. Results were compared to normothermic-freely-moving rats. Cold-restrained rats displayed decreased ACh levels during cold exposure relative to both normothermic-restrained and normothermic-freely-moving rats. By the end of the cold exposure period and following removal from cold, ACh levels had returned to near-baseline values. Normothermic-restrained rats had levels similar to those of normothermic-freely-moving rats, except for a marked increase in ACh following removal from restraint. Cold-restrained rats displayed a gradual elevation in choline levels during cold stress, followed by a gradual decline after stress termination, whereas both normothermic-restrained and normothermic-freely-moving rats displayed gradual decreases during the microdialysis session. These findings demonstrate that central cholinergic neurotransmission can be altered by the application of, and removal from, acute stressors. In addition, the results suggest a possible relationship between the magnitudes of both the stressor and its cholinergic consequences.     

Feeling threatened about the future: Whites' emotional reactions to anticipated ethnic demographic changes

In many Western countries, the proportion of the population that is White will drop below 50% within the next century. Two experiments examined how anticipation of these future ethnic demographics affects current intergroup processes. In Study 1, White Americans who viewed actual demographic projections for a time when Whites are no longer a numerical majority felt more angry toward and fearful of ethnic minorities than Whites who did not view future projections. Whites who viewed the future projections also felt more sympathy for their ingroup than Whites in the control condition. In Study 2, the authors replicated the effects for intergroup emotions with a sample of White Canadians. White Canadians who thought about a future in which Whites were a numerical minority appraised the ingroup as more threatened, which mediated the effect of condition on intergroup emotions. The authors discuss the implications of these findings for race relations in increasingly diverse societies.     

Coping Options: Missing Links between Minority Group Identification and Psychological Well-Being

Using concepts from social identity theory ( Tajfel & Turner, 1979 ) and Lazarus and Folkman's (1984) cognitive theory of stress and coping we tested the capacity for group identification to foster beliefs in one's ability to cope successfully and in turn predict psychological well-being. Black American participants appraised the availability of coping options that varied by level of identity (individual, intragroup, and intergroup) as well as function of coping (problem-focused and emotion-focused). Replicating prior work, participants who were higher in racial group identification reported more positive well-being. Appraisals of individual emotion-focused and intergroup problem-focused options mediated the relationship of group identification with both self-esteem and life satisfaction. Appraisals of intergroup emotion-focused options also partially mediated the relationship between group identification and life satisfaction. Findings suggest that the relationship between minority group identification and well-being may partly be due to its influence over a person's sense that they and their group can respond effectively to disadvantage.     

On the protective role of identification with a stigmatized identity: Promoting engagement and discouraging disengagement coping strategies

We examined the mechanisms by which ingroup identification impacts well-being in stigmatized groups. Studies 1–3a were conducted among gay people in Europe and North America. Among gay people, the results suggest identification with homosexuals protected well-being via a decrease in self-group distancing (Studies 1–3a, N = 1,055). Other coping strategies were associated with identification but had no relationship with well-being. Identification was positively related to engagement coping strategies (i.e., collective action, group affirmation and ingroup support), and negatively related to disengagement strategies (i.e., ingroup blaming and avoidance of discrimination). Study 3b examined these mechanisms among Black Americans (N = 203). Again, identification was positively related to engagement coping, and negatively to disengagement; however, only collective action (positively) predicted well-being. Results are discussed in terms of how the effectiveness of different strategies for coping with stigma will differ depending on features of the intergroup context, such as the level of permeability of intergroup boundaries.