Neurocognitive correlates of white matter quality in adolescent substance users

Background

Progressive myelination during adolescence implicates an increased vulnerability to neurotoxic substances and enduring neurocognitive consequences. This study examined the cognitive manifestations of altered white matter microstructure in chronic marijuana and alcohol-using (MJ + ALC) adolescents.

Methods

Thirty-six MJ + ALC adolescents (ages 16–19) and 36 demographically similar controls were evaluated with diffusion tensor imaging (Bava et al., 2009) and neurocognitive tests. Regions of group difference in fractional anisotropy (FA) and mean diffusivity (MD) were analyzed in relation to cognitive performance.

Results

In users, lower FA in temporal areas related to poorer performance on attention, working memory, and speeded processing tasks. Among regions where users had higher FA than controls, occipital FA was positively associated with working memory and complex visuomotor sequencing, whereas FA in anterior regions was negatively associated with verbal memory performance.

Conclusions

Findings suggest differential influences of white matter development on cognition in MJ + ALC using adolescents than in non-using peers. Neuroadaptation may reflect additive and subtractive responses to substance use that are complicated by competing maturational processes.     

Influence of the cross–cultural environment on the perception of aging and adult development in the developing world: A study of Bahrain, Brazil and Indonesia

The present study examined the perceived characteristics associated with the different stages of adulthood in developing societies. Respondents from three societies, Bahrain, Brazil and Indonesia, identified those characteristics that are typical of the early, middle and late adulthood stages in their respective societies. Although developing nations, these societies differed in their levels of modernization or on the UN human development index score and respondents identified characteristics that were both common and different. On the whole, the characteristics identified reflected the influence of a cross–cultural environment (which included the global, developed and developing dimensions) on the perception of aging and adult development in developing societies.     

Enhancing Program Quality in a National Sample of After‐school Settings: The Role of Youth–Staff Interactions and Staff/Organizational Functioning

Using multilevel data from the national evaluation of Boys and Girls Clubs of America (BGCA), this study examined associations among programmatic structures, workplace and workforce characteristics, and relational practices of program staff as they relate to young people's ratings of their experience attending local clubs. The sample included 57,710 members and 5,231 staff members at 740 BGCA sites throughout the United States. Staff relational practices—including establishing caring relationships, setting high expectations, positive behavior management, encouraging youth input and agency, and cultural sensitivity—explained associations between staffing and organizational functioning and youths’ perceptions of the quality of their clubs. Findings suggest a central role of staff relational practices in establishing conditions that youth experience positively, and that staffing and organizational processes, including community engagement and teamwork and efficiency can be viewed as foundations for establishing a culture of positive adult‐youth interaction, which in turn can contribute to the promotion of positive youth development. Further, identification with the experiences of youth had a direct association with youths’ perceptions of club quality. These results underscore the importance of staff workforce development initiatives as key to improving youth experiences in after‐school programs.     

Can a before-school physical activity program decrease bullying victimization in disadvantaged children? The Active-Start Study

Background/ObjectiveTo test the effectiveness of an 8-week before-school physical activity program to reduce bullying victimization among a group of socially disadvantaged children in the Active-Start study.MethodA non-blinded randomized controlled trial was conducted in three public schools classified as highly vulnerable and located in a deprived area of Santiago (Chile). A total of 5 classes participated, totaling 170 fourth grade children. The intervention was delivered before starting the first school-class (8:00–8:30 a.m.). The program lasted for 8 weeks. Primary outcome measurement on bullying victimization was assessed by the CUBE questionnaire at baseline and post-intervention.ResultsThere was a statistically significant reduction in the probability of suffering physical bullying (OR= 0.18, 95% CI, 0.04-0.82; p= .027) and verbal bullying (OR=0.13, 95% CI, 0.02-0.97; p= .046) after the 8-week program.ConclusionsParticipation in an 8-week before-school physical activity intervention implemented in schools located in a disadvantaged district in Santiago (Chile) resulted in lower levels of bullying victimization among study participants. The Active-Start program may be a feasible and potentially scalable intervention option to improve the climate and pro-sociality environment at schools.     

Three Models of Global Community

Debates about global justice tend to assume normative models of global community without justifying them explicitly. These models are divided between those that advocate a borderless world and those that emphasize the self-sufficiency of smaller political communities. In the first case, there are conceptions of a community of trade and a community of law. In the second case, there are ideas of a community of nation-states and of a community of autonomous communities. The nation-state model, however, is not easily justified and is one that has been criticized extensively elsewhere. The model of a community of trade underlies both advocates of market-oriented development and exponents of global schemes of redistribution of resources and incomes. I analyze the work of Charles Beitz, Peter Singer, and Thomas Pogge to show that the assumption that global interdependence is beneficial is poorly justified. The model of a community of law, as seen in the work of Henry Shue and others, is the basis for arguments against state sovereignty and in favor of international human rights regimes. I argue that this model suffers either from a problem of practicability or of hegemony. Finally, the model of a community of autonomous communities uses notions of patriotism and sovereignty to maintain that disengagement and independence are the best routes to global peace and justice.     

Quantitative and Qualitative Research: Beyond the Debate

Psychology has been a highly quantitative field since its conception as a science. However, a qualitative approach to psychological research has gained increasing importance in the last decades, and an enduring debate between quantitative and qualitative approaches has arisen. The recently developed Mixed Methods Research (MMR) addresses this debate by aiming to integrate quantitative and qualitative approaches. This article outlines and discusses quantitative, qualitative and mixed methods research approaches with specific reference to their (1) philosophical foundations (i.e. basic sets of beliefs that ground inquiry), (2) methodological assumptions (i.e. principles and formal conditions which guide scientific investigation), and (3) research methods (i.e. concrete procedures for data collection, analysis and interpretation). We conclude that MMR may reasonably overcome the limitation of purely quantitative and purely qualitative approaches at each of these levels, providing a fruitful context for a more comprehensive psychological research.

Negotiating Dominant Masculinity Ideology: Strategies Used by Gay, Bisexual and Questioning Male Adolescents

In the context of a U.S. dominant masculinity ideology, which devalues men who are not heterosexually identified, many gay, bisexual and questioning (GBQ) adolescent males must develop their own affirming and health-promoting sense of masculinity. In order to promote the well-being of GBQ young men, exploration of their reactions and responses to dominant images of masculinity is needed. We qualitatively analyzed interviews with 39 GBQ African American, Latino, and European American male adolescents (15–23 years old). Participants reported a range of responses to traditional masculinity ideologies, most of which centered on balancing presentations of masculine and feminine characteristics. Negotiation strategies served a variety of functions, including avoiding anti-gay violence, living up to expected images of masculinity, and creating unique images of personhood free of gender role expectations. These data suggest a complex picture of GBQ male adolescents’ management of masculinity expectations and serve as a basis for culturally and developmentally specific HIV prevention programs.