Reciprocal relations between adolescent substance use and delinquency: a longitudinal latent variable analysis

Reciprocal relations between self-reported substance use and delinquency were examined through the analysis of 4-wave panel data collected from 1,218 high school students. A longitudinal, latent-variable framework was used to investigate interrelationships between changing patterns of generalized involvement in these 2 problem behaviors, while simultaneously accounting for specificity in drug use (e.g., marijuana use) and delinquency (e.g., theft). Analyses revealed that a model of bidirectional effects between polysubstance use and general delinquency was plausible for boys but not for girls. For boys, the effect of delinquency on substance use was small but consistent over time, whereas the effect of substance use on delinquency was larger but restricted to the earlier waves of the study. Implications for the question of whether or not substance use and delinquency have causal connections are discussed.     

Combining dynamic systems and multivariate analyses to compare the mother-child interactions of externalizing subtypes

A dynamic systems analysis was conducted to distinguish the parent–child interactions of pure externalizing children from children comorbid for externalizing and internalizing problems. Thirty-three parents and clinically referred children (8–12 years old) discussed a problem for 4 min and then tried to wrap up in response to a signal (a perturbation). The perturbation was intended to increase the pressure on the dyad, triggering a reorganization of their behavioral system. We hypothesized that the comorbid group would be distinguished from the externalizing-only group as a result of this reorganization, but not before. The sequential data were analyzed using a combination of case-sensitive (state space grids and chi-square analyses) and group-based, multivariate techniques (log-linear modeling). Results revealed that externalizing dyads engaged in a permissive pattern throughout the problem-solving session, whereas comorbid dyads shifted from a permissive pattern to a mutually hostile pattern after the perturbation. These findings punctuate the need for a dynamic systems approach to the study of relationship processes associated with the development of childhood psychopathology. Theoretical and clinical implications are discussed.     

Exposure to suicide: incidence and association with suicidal ideation and behavior: United States, 1994

Exposure to the suicide of another is common, but the magnitude and effects of such exposure are not well quantified. From a national random telephone survey of U.S. adults, we estimated the 12-month incidence of exposure to suicide and its association with suicidal ideation, planning, and behavior. Of 5,238 respondents, 342 (a weighted 7.0% representing 13.2 million persons) reported knowing a suicide decedent from the previous year. Univariate analysis showed persons reporting such exposure were significantly more likely to describe suicidal ideation and behavior than those unexposed; multivariate analysis showed no association. Though the risk related to suicide exposure may be small, given the magnitude of exposure, it may warrant intervention efforts because of its potential societal impact.     

Editor's Introduction: Theory and Engagement in Bioethics

Theoretical Medicine and Bioethics -     

A Test of Three Alternative Hypotheses Regarding the Effects of Early Delinquency on Adolescent Psychosocial Functioning and Substance Involvement

This study compared alternative hypotheses (from general deviance, life course, and developmental psychopathology perspectives) regarding the effects of early adolescent delinquency on psychosocial functioning in family, school, and peer contexts, and on alcohol use. Analyses also examined parent-child negative affective quality, prosocial school orientation, and peer substance use as possible direct predictors of problem substance use. Participants in this longitudinal study, extending from age 11 to age 18, were 429 rural teens (222 girls) and their families. Path model comparisons supported the tenability of a partial mediation model that included mediating pathways and a direct effect of delinquency on alcohol use, as hypothesized by developmental psychopathology. A supplemental analysis controlling for the stability of the family, school, and peer variables revealed that delinquency had less pervasive direct effects on, and a nonsignificant indirect effect through, changes in the mediators over time. Results also showed that peer substance use was a direct positive predictor of problem use.     

On how high performers keep cool brains in situations of cognitive overload

What happens in the brain when we reach or exceed our capacity limits? Are there individual differences for performance at capacity limits? We used functional magnetic resonance imaging (fMRI) to investigate the impact of increases in processing demand on selected cortical areas when participants performed a parametrically varied and challenging dual task. Low-performing participants respond with large and load-dependent activation increases in many cortical areas when exposed to excessive task requirements, accompanied by decreasing performance. It seems that these participants recruit additional attentional and strategy-related resources with increasing difficulty, which are either not relevant or even detrimental to performance. In contrast, the brains of the high-performing participants “keep cool” in terms of activation changes, despite continuous correct performance, reflecting different and more efficient processing. These findings shed light on the differential implications of performance on activation patterns and underline the importance of the interindividual-differences approach in neuroimaging research.     

Visual binding of English and Chinese word parts is limited to low temporal frequencies

Some perceptual mechanisms manifest high temporal precision, allowing reports of visual information even when that information is restricted to windows smaller than 50 ms. Other visual judgments are limited to much coarser time scales. What about visual information extracted at late processing stages, for which we nonetheless have perceptual expertise, such as words? Here, the temporal limits on binding together visual word parts were investigated. In one trial, either the word 'ball' was alternated with 'deck', or 'dell' was alternated with 'back', with all stimuli presented at fixation. These stimuli restrict the time scale of the rod identities because the two sets of alternating words form the same image at high alternation frequencies. Observers made a forced choice between the two alternatives. Resulting 75% thresholds are restricted to 5 Hz or less for words and nonword letter strings. A similar result was obtained in an analogous experiment with Chinese participants viewing alternating Chinese characters. These results support the theory that explicit perceptual access to visual information extracted at late stages is limited to coarse time scales.     

Evolution of the biopsychosocial model: prospects and challenges for health psychology.

Although advances have been made in specifying connections between biological, psychological, and social processes, the full potential of the biopsychosocial model for health psychology remains untapped. In this article, 4 areas that need to be addressed to ensure the continued evolution of the biopsychosocial model are identified and a series of recommendations concerning initiatives directed at research, training, practice and intervention, and policy are delineated. These recommendations emphasize the need to better understand and utilize linkages among biological, psychological, social, and macrocultural variables. Activities that facilitate the adoption of a multisystem, multilevel, and multivariate orientation among scientists, practitioners, and policymakers will most effectively lead to the kinds of transdisciplinary contributions envisioned by the biopsychosocial perspective.