Alcohol Use in Adolescent Twins and Affiliation with Substance Using Peers

Affiliation with substance using peers is one of the strongest predictors of adolescent alcohol use. This association is typically interpreted causally: peers who drink incite their friends to drink. This association may be complicated by uncontrolled genetic and environmental confounds because teens with familial predispositions for adolescent substance use may be more likely to select into social networks where drinking is common. We test this alternative hypothesis using a sample of 1,820 twin and sibling pairs, and their same-sex best friends, from three waves of the National Longitudinal Study of Adolescent Health. Across all three waves, peer report of substance use did not influence adolescent alcohol use when genetic and shared environmental predispositions for drinking were considered. The association between alcohol use and peer behavior may be a spurious association attributable to a shared genetic liability to drink alcohol and associate with peers who drink alcohol.     

Searching for an environmental effect of parental alcoholism on offspring alcohol use disorder: a genetically informed study of children of alcoholics

The children-of-twins design was used to isolate a potentially causal environmental impact of having an alcoholic parent on offspring alcohol use disorder, by an examination of whether the children of alcoholics were at a higher risk for alcohol use disorders than were the children of nonalcoholic parents, even after correlated familial factors were controlled. Participants were 1,224 male and female twins from 836 twin pairs selected from the Australian Twin Registry, 2,334 of the twins' 18-39-year-old offspring, and 983 spouses of the twins. Lifetime histories of Diagnostic and Statistical Manual of Mental Disorders (4th ed.) alcohol use disorders were obtained by structured, psychiatric, telephone interviews conducted individually with each of the family members. Comparisons of the offspring of twins who were discordant for alcoholism indicated that there was no longer a statistically significant difference between the children of alcoholics and the children of nonalcoholics after genetic and family environmental factors correlated with having an alcoholic parent were controlled. The results of this study suggest that the direct causal effect of being exposed to an alcoholic parent on offspring alcohol use disorder is modest at best.     

Stimulus complexity and information integration in the spontaneous interpretations of line graphs

Viewers of a graph will readily interpret its contents, even when given no explicit instructions regarding what information to extract. However, little is known about the strategies that subjects adopt when making such spontaneous interpretations. In the present experiments, subjects studied single-function line graphs for self-determined periods. They provided written interpretations immediately following examination of each graph. The structural complexity of stimulus graphs was varied by eliminating symmetry, and by adding data points, departures from linearity, and trend reversals. Across two experiments, number of trend reversals was the main determinant of comprehension difficulty as measured by study times. An increased number of reversals also resulted in more local, detail-oriented content in interpretations. By contrast, the presence of such emergent features as symmetry and linearity led to increases in the amount of integrative, global content in interpretations, usually at the expense of local detail. Surprisingly, increases in the number of data points led to similar increases in the grain of subjects' interpretations. The last finding may reflect a shift from point-by-point to integrative study strategies necessitated by capacity limitations in working memory.     

How does cognition evolve? Phylogenetic comparative psychology

Now more than ever animal studies have the potential to test hypotheses regarding how cognition evolves. Comparative psychologists have developed new techniques to probe the cognitive mechanisms underlying animal behavior, and they have become increasingly skillful at adapting methodologies to test multiple species. Meanwhile, evolutionary biologists have generated quantitative approaches to investigate the phylogenetic distribution and function of phenotypic traits, including cognition. In particular, phylogenetic methods can quantitatively (1) test whether specific cognitive abilities are correlated with life history (e.g., lifespan), morphology (e.g., brain size), or socio-ecological variables (e.g., social system), (2) measure how strongly phylogenetic relatedness predicts the distribution of cognitive skills across species, and (3) estimate the ancestral state of a given cognitive trait using measures of cognitive performance from extant species. Phylogenetic methods can also be used to guide the selection of species comparisons that offer the strongest tests of a priori predictions of cognitive evolutionary hypotheses (i.e., phylogenetic targeting). Here, we explain how an integration of comparative psychology and evolutionary biology will answer a host of questions regarding the phylogenetic distribution and history of cognitive traits, as well as the evolutionary processes that drove their evolution.     

Feasibility and Acceptability of Technology-supported Sexual Health Education Among Adolescents Receiving Inpatient Psychiatric Care

Journal of Child and Family Studies - Mental illness in adolescence is associated with high-risk sexual behaviors including multiple sex partners, infrequent or inconsistent condom use, and nonuse...     

A National Evaluation of Community-Based Youth Cessation Programs: End of Program and Twelve-Month Outcomes

Most youth cessation treatment research consists of efficacy studies in which treatments are evaluated under optimal conditions of delivery. Less is known about the effectiveness of youth cessation treatments delivered in real-world, community based settings. A national sample of 41 community-based youth cessation programs participated in a longitudinal evaluation to identify site, program, and participant characteristics associated with successful cessation. Validated quit rates were comparable to those in randomized controlled trials; 7-day abstinence at the end of program averaged 14% and 30-day abstinence at 12 months averaged 12%. Multivariate GEE models explored predictors of smoking cessation at the end of the programs and at 12 months. Results showed correlates of both short- and long-term cessation. Findings point to the importance of both individual and community-level variables, including motivation, opportunities for and encouragement to engage in activities outside of academics, having youth participate in treatment before they become highly dependent smokers, and community norms and ordinances that discourage youth purchase, use and possession of tobacco. Providing evidence-based treatment to youth in community-based settings results in successful cessation.     

Child–Mother Attachment Security and Child Characteristics as Joint Contributors to Young Children's Coping in a Challenging Situation

Moderate challenges provide opportunities for young children to develop coping skills, yet little is known about factors related to individual differences in early coping. This study investigated child–mother attachment security (9‐point rating) assessed via a modified Strange Situation procedure, child expressive language, and child social fearfulness as contributors to coping responses among 33‐month‐old children (N = 128, 66 girls) following receipt of an empty gift box. Associations between child–mother attachment security and child coping were moderated by child characteristics. As hypothesized, greater attachment security was associated with more action towards the stressor (i.e. vocalizing about the empty box and searching for the missing gift), but only for children high on social fearfulness. Further, greater attachment security was associated with seeking more physical proximity to mothers for children low on expressive language and less physical proximity for children high on expressive language. Lastly, greater attachment security was related to more self‐distraction for children with moderate to high expressive language. Results are discussed in terms of child–mother attachment security as a psychological resource constructed over time, which the child may draw upon when confronted with a moderate non‐attachment‐related stressor. Copyright © 2014 John Wiley & Sons, Ltd.