Appetitive instrumental learning is impaired by inhibition of cAMP-dependent protein kinase within the nucleus accumbens.

The medium spiny neurons of the nucleus accumbens receive a unique convergence of dopaminergic and glutamatergic inputs from regions associated with motivational, cognitive, and sensory processes. Long-term forms of plasticity in the nucleus accumbens associated with such processes as appetitive learning and drug addiction may require coactivation of both dopamine D1 and glutamate N-methyl-D-aspartate (NMDA) receptors. This notion implies that an intracellular mechanism is likely to be involved in these long-term neuroadaptive processes. The present series of experiments examined the effects of intra-accumbens microinfusion of protein kinase inhibitors on acquisition of an instrumental task, lever-pressing for food. Male Sprague-Dawley rats were bilaterally implanted with chronic indwelling cannulae aimed at the nucleus accumbens core. Following recovery, animals were food-restricted and subsequently trained for operant responding. The broad-based serine/threonine kinase inhibitor H-7 (5 or 27 nmol per side) dose-dependently impaired learning when infused immediately after testing on days 1-4. Rp-cAMPS, a cAMP-dependent protein kinase (PKA) inhibitor, also impaired learning regardless of whether it was infused immediately before (5 or 20 nmol) or immediately after (10 nmol) testing on days 1-4. Rp-cAMPS (10 nmol) also inhibited learning when infused 1 h after testing, though to a lesser extent than when administered before or immediately after testing. The PKA stimulator Sp-cAMPS (5 or 20 nmol) also impaired learning when infused before testing, suggesting that there is an optimal level of PKA activity required for learning. None of the drugs used produced nonspecific motor or feeding effects. These results provide evidence supporting the involvement of nucleus accumbens PKA in appetitive learning and suggest that this kinase may be involved in long-term changes associated with this and other motivationally based neuroadaptive processes.     

VERB™ Summer Scorecard: Findings from a Multi-level Community-based Physical Activity Intervention for Tweens

The benefits of physical activity for adolescents are well established. Multi-level interventions may be especially effective in establishing and sustaining health-enhancing behaviors. This study explored the influences of a multi-level community intervention aimed at increasing physical activity among tweens (youth 9–13). Two Florida school districts far apart served as intervention and comparison sites in a quasi-experimental post-test design. Youth in grades 5 through 8 in the intervention community (n = 1,253) and comparison community (n = 866) completed an anonymous post-intervention survey. An intent-to-treat analysis did not show any statistically significant group differences for the physical activity outcomes examined. However, a subset analysis revealed that students who reported participating in the intervention were more likely to be physically active than youth in the comparison group, as well as youth in the intervention community who reported not participating. Participating in the intervention was significantly related to meeting recommendations for vigorous physical activity (OR = 2.08, P = 0.0259), being physically active on weekends (OR = 1.84, P = 0.0017), and reporting more days of trying a new game or sport (OR = 1.49, P = 0.046) after controlling for grade, gender, race/ethnicity, and SES. These findings support the efficacy of multi-level interventions to create effective health behavior change, especially when linkages among community, media, schools, and the home are present.     

Continuity and change in social and physical aggression from middle childhood through early adolescence

For a sample followed from age 9–13 (N=281), this investigation examined developmental trajectories for social and physical aggression as measured by teacher ratings. Trajectories for both forms of aggression were estimated first separately, then jointly. Mean levels of both social and physical aggression decreased over time for the overall sample, but with high variability of individual trajectories. Subgroups followed high trajectories for both social and physical aggression. Joint estimation yielded six trajectories: low stable, low increasers, medium increasers, medium desisters, high desisters, and high increasers. Membership in the high increaser group was predicted by male gender, unmarried parents, African American ethnicity, and maternal authoritarian and permissive parenting. Permissive parenting also predicted membership in the medium increaser group. This is one of the first studies to examine social aggression longitudinally across this developmental period. Though the results challenge the claim that social aggression is at its peak in early adolescence, the findings emphasize the importance of considering different developmental trajectories in trying to understand origins and outcomes of aggression. Aggr. Behav. 35:357–375, 2009. © 2009 Wiley‐Liss, Inc.     

Gendered Ways to Motivation Gains in Groups

Recent studies have demonstrated motivation gains of low performing group members even beyond the level of an individual work baseline (e.g., Weber and Hertel, Journal of Personality and Social Psychology, 93:973–993, 2007). We expected that the underlying mechanisms of these motivation gains, i.e., social indispensability and social competition, are moderated by individuals’ gender. Moreover, these gender effects were assumed to be moderated by partner anonymity. Predictions were tested with mostly undergraduate German students (N?=?213) working in same-gender groups in a computer-supported environment. Results revealed that motivation gains due to social indispensability were more likely for women, whereas motivation gains due to social competition were more likely for men. Furthermore, women compared to men showed higher motivation gains in anonymous conditions compared to conditions with an acquainted partner.     

Putting Social Psychology into Serious Games

Video or computer gaming is quickly becoming a significant part of many people's lives. We review several emerging themes in both the social psychological literature and popular culture that show the potential for a productive integration of social psychology and video gaming. In particular, we examine the growing impact of serious games and outline some social psychological principles that could be implemented in the context of games for social cognitive training.     

The relationship between temperament and personality: An exploratory study

Although the terms temperament and personality are often used interchangeably in the literature and clearly are conceptually related, there is little empirical data to illuminate their relationship. In this exploratory study we measured temperament (using the Dimensions of Temperament Survey), and personality (using the Eysenck Personality Questionnaire), in young adolescents and in adults. Some age and sex differences in relationships between the measures and their correlations were found. The temperament dimension of adaptability was clearly related to Eysenck's Extraversion factor and reactivity to Neuroticism in females. More substantial relationships emerged in the adult sample than in the adolescent group, Our data, combined with that of a 1984 Australian study using different techniques, provides substantial support for measurable overlap between some dimensions of temperament derived largely from the developmental literature, and Eysenck's personality theory.     

The welcome baby program: A community-based volunteer prevention model of caring,sharing, and support for new parents

Primary prevention is one of the most important components of any community child abuse and neglect program. Welcome Baby is a community-based, volunteer primary prevention program that offers caring, sharing, and support to parents of newborns through hospital visitation and follow-up contacts during the adjustment period that surrounds the birth of a baby. Program goals include personal support for the new mother, prevention of child abuse and neglect by providing support and information for all parents, reinforcement of strengths and support for quality parenting, improving emotional preparation for parenthood, and early identification and intervention for families with the potential for maltreatment. Program rationale and conclusions agree with research findings that early and consistent support and intervention with high-risk families improve the quality of parent-child interaction and significantly reduce the risk of maltreatment. This article outlines the basic philosophy, goals, and operations of this community prevention program.     

The influence of maternal employment on gender role attitudes of men and women

The effects of maternal employment on young adults' gender role attitudes were assessed. A random sample of 111 males and 131 females was surveyed [179 Whites (74.0%), 35 Blacks (14.5%), and 28 others (typically Asian-Americans, 11.5%)]. Results varied depending on which gender role attitudes were being examined. With respect to approval of mother working outside the home, only the respondent's age when his or her mother began working was significant. However, this relationship was not found when assessing attitudes about the separate spheres ideology. Thus, it appears that attitudes toward women working depend on whether the respondent's mother worked, whereas beliefs about adult male—female equality do not appear to be as closely related to childhood experiences. Mothers' occupations were unrelated to all of the attitudes examined, as were her children's perceptions of how satisfied she was with her primary work role (employed or nonemployed). Finally, the only significant predictors of gender role attitudes to be discovered were the sex of respondent and attendance at religious services. Females expressed more egalitarian gender role attitudes, and those who reported frequent attendance at religious services were more likely to endorse traditional gender roles.This article was part of a master's thesis conducted at the University of Virginia by the first author.We gratefully acknowledge the assistance of Paul W. Kingston in proposal formulation and survey construction, Lance C. Bloom in data collection, and the helpful comments made by the anonymous reviewers ofSex Roles.     

Stability of masculinity-femininity scores over an eleven-year period

The Gough Femininity Scale was administered to students in an introductory psychology class at an urban community college over an 11-year period. Means for male and female students maintained the same relative difference for the 11 years and were not different from Gough's 1952 standardization sample.