Effects of Timing of Adversity on Adolescent and Young Adult Adjustment

Effects of Timing of Adversity on Adolescent and Young Adult Adjustment Abstract Exposure to adversity during childhood and adolescence predicts adjustment across development. Further, adolescent adjustment problems persist into young adulthood. This study examined relations of contextual adversity with concurrent adolescent adjustment and prospective mental health and health outcomes in young adulthood. A longitudinal sample (N = 808) was followed from age 10 through 27. Perceptions of neighborhood in childhood predicted depression, alcohol use disorders, and HIV risk in young adulthood. Further, the timing of adversity was important in determining the type of problem experienced in adulthood. Youth adjustment predicted adult outcomes, and in some cases, mediated the relation between adversity and outcomes. These findings support the importance of adversity in predicting adjustment and elucidate factors that affect outcomes into young adulthood.     

World Class Manufacturing: Further Evidence in the Lean Production Debate1

This paper reports the results of a study into the performance and management practices of 18 autocomponents plants, nine of which were located in the UK and nine in Japan. The study compared the performance of these plants and used quantitative measures to test the use of lean production techniques among the high performers. Five plants displayed high performance on measures of both productivity and quality. All of these were located in Japan. Several measures of management practice provided some support for the lean production model, particularly in the area of process discipline and control; measures of human resource management policy and work organization proved less significant. Contextual factors pointed to the conditions necessary to support lean production; higher performing plants had more stable demand and lower absenteeism.     

Modeling Cholinesterase Activity for Human Dietary Risk Assessment of Carbamate Insecticides

This article demonstrates statistical models to quantify the interaction between a carbamate insecticide and acetylcholinesterase. Carbamates are a class of chemicals that inhibit the activity of acetylcholinesterase in humans, an enzyme involved in the regulation of the neurotransmitter acetylcholine. Following exposure to a carbamate insecticide, we specifically address (1) if acetylcholinesterase activity recovers to its level of preexposure activity; (2) the level of inhibition of acetylcholinesterase activity; (3) the recovery time of acetylcholinesterase activity to its preexposure level for a typical individual; and (4) the upper percentiles of the recovery time of acetycholinesterase activity across individuals. A nonlinear mixed-effects model is fitted to data from a repeated measures experiment conducted with human volunteers randomly assigned to a control and four dose groups. Repeated measurements were taken prior to exposure and at 1, 2, 4, 6, 8, and 21 hours after exposure to the carbamate aldicarb. It was found that full recovery did occur. Inhibition at 1 hour was estimated with maximum inhibition most likely occurring prior to 1-hour postexposure. In addition, recovery was rapid even for sensitive individuals. Given this information, the potential effect from exposure to a carbamate consumed in the diet during a day can be quantitatively assessed.     

Making a Difference: Sebastião Salgado and the Social Life of Mobilization

This article is part of a panel discussion addressing the sociological relevance of Sebastião Salgado’s work as well as documentary photography in general. ²     

Recent Suicide Attempts Across Multiple Social Identities Among Gay and Bisexual Men: An Intersectionality Analysis

This study draws from intersectionality to describe variations in recent suicide attempts (RSA) among gay and bisexual men (GBM) across sociodemographics. Using survey data, logistic regression modeling explored RSA in two analytical stages: (1) the individual effects of each sociodemographic were measured; (2) two-way interaction terms between sociodemographics were tested and added to the models created in stage A. In stage A, only education and income achieved significance. In stage B, the study found that (a) education and income interacted significantly such that the odds of RSA increased for those with a lower income and a lower education; (b) sexual orientation and partnership status interacted, resulting in decreased odds among bisexual men in heterosexual partnerships; and (c) income and education interacted with geography; the effects of these variables were significant only among urban men. These findings suggest that GBM are at unequal risk of RSA according to intersecting sociodemographics.     

Author disincentives and open access

All parties in the scholarly-information marketplace agree that any Open Access (OA) system will have to account for the costs of disseminating scholarly information and of editing, publishing and distributing it. There has been less discussion of the fact that for an OA forum to succeed, it will have to be accepted and supported by authors. Author charges, a relative lack of prestige, and the required abdication of copyright are three characteristics of many currently emerging OA models that may pose significant barriers to author acceptance. These will have to be addressed if OA providers wish to be competitive with non-OA providers.     

Uniform validity of saddlepoint expansion on compact sets

This paper shows that Daniels's (1954) saddlepoint expansion for the density of a sample mean is, for all practical purposes, always uniformly valid on compact subsets in the interior of the domain of the mean. This uniform validity is the key for establishing the relation between the saddlepoint expansion for the density function and Lugannani and Rice's expansion for the tail probability, and for establishing the validity of a high-order asymptotic expansion for the density of a standardized mean.     

Historic preservation: A statutory vehicle for disparate agendas

During the past 100 years historic preservation has gravitated between portrayals as protector of the nation's cultural heritage, to an impediment of necessary development. Shifting coalitions, most often bent upon pursuing agendas having little to do with the essence of historic preservation, banded together securing statutory provisions largely incremental or symbolic in substance. Of significance was the decades long absence of an issue monopoly, an absence that is not fully explored in the existing policy literature. This study provides insights into the shifts in coalition stability and statutory outputs absent an issue monopoly.     

Influence of a Family‐Focused Substance Use Preventive Intervention on Growth in Adolescent Depressive Symptoms

Preparing for the Drug Free Years (PDFY) is a preventive intervention that targets parenting behaviors, family interaction patterns, and adolescent substance use, factors that have been shown to predict depression among teenagers. Effects of PDFY on trajectories of self‐reported adolescent depressive symptoms from 6th through 12th grade were examined. Latent growth curve modeling was used to analyze data from 429 rural adolescents from schools assigned randomly to an intervention or a control condition. PDFY reduced the rate of increase in depressive symptoms during adolescence. Mediation of the intervention effect on depressive symptoms through reduced polysubstance use was tested; the indirect effect was only marginally significant. Findings have implications for understanding the relationship between adolescent depressive symptoms and substance use, and for preventing these outcomes.     

Four‐Month‐Olds' Discrimination of Optic Flow Patterns Depicting Different Directions of Observer Motion

One of the most powerful sources of information about spatial relationships available to mobile organisms is the pattern of visual motion called optic flow. Despite its importance for spatial perception and for guiding locomotion, very little is known about how the ability to perceive one's direction of motion, or heading, from optic flow develops early in life. In this article, we report the results of 3 experiments that tested the abilities of 4‐month‐old infants to discriminate optic flow patterns simulating different directions of self‐motion. The combined results from 2 different experimental paradigms suggest that 4‐month‐olds discriminate optic flow patterns that simulate only large (> 32°) changes in the direction of the observer's motion through space. This suggests that prior to the onset of locomotion, there are limitations on infants' abilities to process patterns of optic flow related to self‐motion.