Effects of multiple exposures to D-cycloserine on extinction of conditioned fear in rats

Previous research has shown that an acute, post-training injection of D-cycloserine (DCS) facilitates extinction of conditioned fear in rats; however, the effects of multiple exposures to DCS in this situation are not known. In Experiment 1, rats were conditioned (light-shock pairings) and 24 h later given six extinction (light-alone) trials followed by an injection of DCS (15 mg/kg) or saline. The next day, all rats were tested for light-elicited freezing. In Experiment 2, the effect of DCS on extinction was tested in the same manner, except that rats were pre-exposed to DCS (0, 1, or 5 injections) just prior to conditioning. In Experiment 3, rats received five pre-exposures of DCS but conditioning occurred either 2 or 28 days after the last pre-exposure. The results showed that DCS facilitated extinction of conditioned freezing to the light CS when no drug pre-exposure had occurred, but pre-exposure to DCS just prior to conditioning disrupted the facilitation of extinction effect. When 28 days were interposed between pre-exposure and conditioning, the facilitatory effects of DCS on extinction were restored. These findings suggest that DCS has significant clinical value but that behavioral desensitization may occur with multiple exposures; however, desensitization is not permanent and is reduced by the passage of time.     

Comparison of the RT3 Research Tracker and Tritrac R3D accelerometers

This study compared the RT3 Research Tracker accelerometer to the Tritrac R3D accelerometer in both laboratory and field settings and tested the hypothesis that the RT3 records higher physical activity counts and smaller standard deviations than the R3D. The RT3 is relatively new and untested and its concurrent validity with existing instruments and physical activity needs to be assessed before being used in research. In this study the RT3 had higher average recordings of physical activity counts in all of the nine testing situations than the R3D. However, in terms of agreement between the instruments, the RT3 might be 582 below or 1,236 above (activity counts) the R3D in assessing physical activity. These results do not establish that the RT3 is more consistently measuring higher physical activity counts than the R3D. Comparing vector magnitude with oxygen consumption and heart rate across the 0% grade testing conditions indicated that the RT3 and R3D are sensitive to changes in various intensities of level ambulation. When the 5%, 10%, and 15% grade on the treadmill protocols were analyzed, low correlations between oxygen consumption and heart rate with vector magnitude responses were found for both the RT3 and R3D. Differences in agreement between the RT3 and R3D did not vary in any systematic way over the range in testing conditions which substantiates that the RT3 and R3D accelerometers are sensitive on flat surfaces but are insensitive to changes in grade.     

The contingent smile: a meta-analysis of sex differences in smiling

The authors present a meta-analysis of sex differences in smiling based on 448 effect sizes derivedfrom 162 research reports. There was a statistically significant tendency for women and adolescent girls to smile more than men and adolescent boys (d = 0.41). The authors hypothesized that sex differences in smiling would be larger when concerns about gender-appropriate behavior were made more conspicuous, situational constraints were absent or ambiguous, or emotion (especially negative) was salient. It was also predicted that the size of the sex difference in smiling would vary by culture and age. Moderator analysis supported these predictions. Although men tend to smile less than women, the degree to which this is so is contingent on rules and roles.     

Models-of-self and models-of-others as related to facial muscle reactions at different levels of cognitive control

The hypotheses of this investigation were based on attachment theory and Bowlby's conception of "internal working models", supposed to consist of one mainly emotional (model-of-self) and one more conscious cognitive structure (model-of-others), which are assumed to operate at different temporal stages of information processing. Facial muscle reactions in individuals with positive versus negative internal working models were compared at different stages of information processing. The Relationship Scale Questionnaire (RSQ) was used to categorize subjects into positive or negative model-of-self and model-of-others and the State-Trait Anxiety Inventory was used to measure trait anxiety (STAI-T). Pictures of happy and angry faces followed by backward masking stimuli were exposed to 61 subjects at three different exposure times (17 ms, 56 ms, 2,350 ms) in order to elicit reactions first at an automatic level and then consecutively at more cognitively elaborated levels. Facial muscle reactions were recorded by electromyography (EMG), a higher corrugator activity representing more negative emotions and a higher zygomaticus activity more positive emotions. In line with the hypothesis, subjects with a negative model-of-self scored significantly higher on STAI-T than subjects with a positive model-of-self. They also showed an overall stronger corrugator than zygomatic activity, giving further evidence of a negative tonic affective state. At the longest exposure time (2,350 ms), representing emotionally regulated responses, negative model-of-self subjects showed a significantly stronger corrugator response and reported more negative feelings than subjects with a positive model-of-self. These results supported the hypothesis that subjects with a negative model-of-self would show difficulties in self-regulation of negative affect. In line with expectations, model-of-others, assumed to represent mainly knowledge structures, did not interact with the physiological emotional measures employed, facial muscle reactions or tonic affective state.     

Counseling,Risk Taking,and the Learning Process

It is crucial that counselors recognize that the problem-solving process that occurs in a counseling situation is synonymous with classroom learning. It is imperative that counselors understand the nature of the problem-solving process and how to guide and nurture this process, to increase their own effectiveness and their counselees' growth. Understanding the concepts of risk taking and intrinsic and extrinsic reinforcement and their relationships to the counselees' problem-solving processes will allow counselors to establish their own counseling approaches and respond to the counselees' learning needs. Jerome Niles is an assistant professor of curriculum and instruction at Virginia Polytechnic Institute and State University in Blacksburg. Marianne DeVoe is an assistant professor of educational foundations at the University of Wyoming in Laramie.     

Power at work: Linking objective power to psychological power

Experimental research conducted with student participants has documented that feeling powerful or powerless (psychological power) affects outcomes with high practical relevance for organizations. However, it is unclear how results from these studies can be generalized to organizational settings in which individuals have various roles that imply more or less objective power. To address this gap, we present a theoretical framework to aid in the understanding of how objective power in organizations affects psychological power. We assume that stable differences in organizational rank (i.e., structural power) determine the likelihood of interactions with superiors, subordinates, or peers. These interactions give rise to within-person variation in situational power which should lead to dynamic fluctuations of psychological power and eventually its outcomes. Results of a preregistered experiment (n = 190 participants) and a preregistered experience sampling study (n = 129 participants) conducted with working adults support our key predictions: Structural power was associated with the likelihood of being in a high power versus low power situation. Within-person differences in situational power were related to feelings of power such as judgments about (1) one's own ability to influence others in a given social situation (i.e., interpersonal power) and (2) one's own competence, agency, autonomy, and independence (i.e., personal power).     

Valorisation du multilinguisme et de l’éducation bilingue dans des familles immigrantes

In this article, we explore the values attributed to multilingualism and bilingual education expressed in interviews with immigrant parents whose children are enrolled in French Immersion programs in the Vancouver metropolitan area. Our analysis indicates that language socialization and language learning encompass more than the transmission of values, practices, and language repertoires to include a collective construction of new practices and language identities. Furthermore, a dialectic of integration and resistance to assimilation appears to underlie the actions of these parents who foster multilingualism in their children as part of a national and international integration strategy.     

Automatic mimicry reactions as related to differences in emotional empathy

The hypotheses of this investigation were derived by conceiving of automatic mimicking as a component of emotional empathy. Differences between subjects high and low in emotional empathy were investigated. The parameters compared were facial mimicry reactions, as represented by electromyographic (EMG) activity when subjects were exposed to pictures of angry or happy faces, and the degree of correspondence between subjects' facial EMG reactions and their self-reported feelings. The comparisons were made at different stimulus exposure times in order to elicit reactions at different levels of information processing. The high-empathy subjects were found to have a higher degree of mimicking behavior than the low-empathy subjects, a difference that emerged at short exposure times (17-40 ms) that represented automatic reactions. The low-empathy subjects tended already at short exposure times (17-40 ms) to show inverse zygomaticus muscle reactions, namely "smiling" when exposed to an angry face. The high-empathy group was characterized by a significantly higher correspondence between facial expressions and self-reported feelings. No differences were found between the high- and low-empathy subjects in their verbally reported feelings when presented a happy or an angry face. Thus, the differences between the groups in emotional empathy appeared to be related to differences in automatic somatic reactions to facial stimuli rather than to differences in their conscious interpretation of the emotional situation.     

Gender Differences and Similarities in Dominance Hierarchies in Same-Gender Groups Based on Speaking Time

This study aimed at investigating whether all-women and all-men groups differed in their hierarchical organization and stability of their rank orders across time. One hundred and sixteen European, middle-class, noncollege women and men (average age: 38) participated in small-group discussions twice within a week with the same group members. Speaking time served as the behavioral dominance indicator on which group hierarchies were based. Additionally, group members rank ordered each other on dominance after each interaction. In the first session, all-men groups were more hierarchically structured than all-women groups. During each session, all-women and all-men groups showed a similar significant increase in hierarchical structuring. For both women and men, rank orders remained stable during interactions and from the first to the second session. Results are discussed in terms of three theoretical models describing dominance hierarchies.