Aging and the perception of biological motion

Two experiments examined how observers' ability to perceive biological motion changes with increasing age. The observers discriminated among kinetic figures, depicting walking, jogging, and skipping. The direction, duration, and temporal correspondence of the motions were manipulated. Quantitative differences occurred between the recognition performances of younger and older observers, but these differences were often modest. The older and younger observers' performances were comparable for most conditions at stimulus durations of 400 ms. The older observers also performed well above chance at shorter durations of 240 and 120 ms. Unlike their performance on other 2- or 3-dimensional motion tasks, older observers' ability to perceive biological motion is relatively well preserved.     

Campaign Contributions,Post-War Reconstruction Contracts,and State Crime

This article presents a case-control study of the relationship between Federal-level campaign contributions, corporate political connections, and the awarding of post-war reconstruction contracts in Iraq and Afghanistan. Cases are 135 companies that received post-war contracts and controls are 135 randomly selected companies matched on industry. Results reveal that both campaign contributions and political connections significantly increase a company's odds of receiving a contract. Results are situated in the context of current theory on state crime. It is argued that awarding contracts on this basis may constitute a form of state crime, but alternative explanations for the findings are also discussed.     

贫困对儿童心理健康的影响及其内在机制

儿童贫困问题是世界范围内的一个重大公共卫生问题。近几十年来,国内外的研究发现贫困对儿童的消极心理健康状态和积极心理健康状态均会产生影响。研究者试图从家庭和社会两个层面来解释贫困对儿童心理健康的影响,以揭示其内在影响机制。未来的研究应加强贫困儿童心理健康发展过程中的保护因素研究,探索儿童期贫困对个体心理健康的长期影响及其成因,进一步在我国社会文化背景下开展本土化研究,为实践上的预防和干预提供帮助。     

Chained and tandem scheduling with children

Children 4 to 7 yr in age were reinforced with trinkets and pennies on chained and tandem schedules. The schedules used were chain DRL FR, chain DRO FR, chain FI FR, tand FI FR, and tand DRO FR. Chain DRL FR and chain DRO FR schedules almost always produced strong schedule and stimulus control, but chain FI FR schedules rarely did if additional techniques were not used. Strong control was produced with chain FI FR schedules, however, if: (a) the FR component was increased in size; (b) schedule and stimulus control was first established with chain DRL FR or chain DRO FR schedules before shifting to the chain FI FR; or (c) an external clock was attached to the FI. Tand FI FR schedules never produced regular or repeatable patterns of responding when additional procedures were not used. Rate patterns resembling those of chain FI FR schedules were produced by tand FI FR schedules, however, if: (a) an external clock was attached to the FI component or (b) control was established by means of tand DRO FR schedules before the tand FI FR was used. Stimulus control was found to be exercised by specific visual stimuli, change of stimuli, and schedule order. Control exercised by schedule order was probably mediated by the child's own behavior which had assumed discriminative stimulus properties.     

TRAINING AND GENERALIZATION OF SEXUAL ABUSE PREVENTION SKILLS FOR WOMEN WITH MENTAL RETARDATION

Previous research has shown that behavioral skills training to teach sexual abuse prevention skills to women with mental retardation results in skill acquisition but poor generalization. In this investigation we evaluated procedures for enhancing generalization following training. Five women with mental retardation received 10 behavioral skills training sessions followed by in situ training when the skills did not fully generalize. Behavioral skills training resulted in skill acquisition and in situ training produced generalized responding during naturalistic assessments.     

Evaluation of a sexual abuse prevention program for adults with mental retardation.

Programs to teach sexual abuse prevention skills to persons with mental retardation have rarely been evaluated empirically, and typical evaluations are limited to assessment of the participants' knowledge rather than their performance of specific skills. In the present study, 6 adult women with mental retardation were trained in sexual abuse prevention, and performance was assessed using four separate measures: pretests and posttests of knowledge, verbal report, role play, and naturalistic probes. All women learned the skills but failed to exhibit them to criterion during the probes. We discuss the implications for further training and assessment of sexual abuse prevention skills.     

Correlates of Satisfaction with a Peer Evaluation System: Investigation of Performance Levels and Individual Differences

The present research examined the effects of performance level and individual differences on participants' satisfaction with a peer evaluation system. One hundred and fifty-three individuals working in groups completed a questionnaire assessing self-monitoring, self-esteem, and individualism. A peer evaluation system was used at the end of the project. Subjects indicated their satisfaction with and reaction to the peer evaluation system. The findings demonstrated that performance level, individualism, self-esteem, and self-monitoring helped to understand and to predict group members' reactions to the peer evaluation system. Implications for future research and implementation of peer rating systems are discussed.