A multidimensional latent trait model for measuring learning and change

A latent trait model is presented for the repeated measurement of ability based on a multidimensional conceptualization of the change process. A simplex structure is postulated to link item performance under a given measurement condition or occasion to initial ability and to one or more modifiabilities that represent individual differences in change. Since item discriminations are constrained to be equal within a measurement condition, the model belongs to the family of multidimensional Rasch models. Maximum likelihood estimators of the item parameters and abilities are derived, and an example provided that shows good recovery of both item and ability parameters. Properties of the model are explored, particularly for several classical issues in measuring change.     

The momentum of human behavior in a natural setting

Adults with mental retardation in a group home received popcorn or coffee reinforcers for sorting plastic dinnerware. In Part 1 of the experiment, reinforcers were dispensed according to a variable-interval 60-s schedule for sorting dinnerware of one color and according to a variable-interval 240-s schedule for sorting dinnerware of a different color in successive components of a multiple schedule. Sorting rates were similar in baseline, but when a video program was shown concurrently, sorting of dinnerware was more resistant to distraction when correlated with a higher rate of reinforcement. In Part 2 of the experiment, popcorn or coffee reinforcers were contingent upon sorting both colors of dinnerware according to variable-interval 60-s schedules, but additional reinforcers were given independently of sorting according to a variable-time 30-s schedule during one dinnerware-color component. Baseline sorting rate was lower but resistance to distraction by the video program was greater in the component with additional variable-time reinforcers. These results demonstrate that resistance to distraction depends on the rate of reinforcers obtained in the presence of component stimuli but is independent of baseline response rates and response–reinforcer contingencies. Moreover, these results are similar to those obtained in laboratory studies with pigeons, demonstrating that the determination of resistance to change by stimulus–reinforcer relations is not confined to controlled laboratory settings or unique to the pigeon.     

科学研究中的非预期事件与态度改变

本文针对高新技术迅猛发展过程中出现的非预期事件 ,围绕潜在的负面效应及其影响范围展开系统分析 ,同时以态度干扰技术穿插于原始态度测量与结果态度测量 (SD方法 )之间 ,探讨、分析科学研究中的重大突发性事件 (克隆绵羊 )对大学生科技态度的负面影响。分析结果发现各类被试对生物技术的态度均出现显著性的变化 ,由较积极、赞同的方向向较消极、中立方向发生态度改变。论文在借鉴同类研究的基础上 ,尝试应用免疫理论等作为对策性建议。     

Remaining Radical? Organizational Predictors of Rape Crisis Centers' Social Change Initiatives

Rape crisis centers have undergone significant changes since their birth during the feminist movement of the 1970s. As has happened with many other radical social movements, there is growing evidence that the antirape movement has become more institutionalized. This research used a combination of quantitative and qualitative methods to examine the current structure and functions of a national random sample of 168 rape crisis centers. An organizational-level model predicting involvement in three types of social change activities was tested: (a) participation in public demonstrations to raise awareness about sexual assault; (b) political lobbying for violence against women legislation; and (c) primary prevention programs to eliminate sexual violence against women. Results of logit modeling suggested that how long a rape crisis center had been in existence moderated the relationships between organizational characteristics and involvement in community activism. Findings of this study suggest that although many of today's centers bear little resemblance to the grass-roots collectives of years past, rape crisis centers have been remarkably adaptive in weathering changing political climates to continue to provide comprehensive services for rape victims.     

论中医学体系突变的失败

中医学在其体系西藏怕初、中期,其抽象的哲学化的体系比具体的物质基础构成的体系更具有弹性和优越性。随着科学的发展,因不恰当地借助于哲学化处理的中医学在近现代并未得到发展,但由于中医学已具有哲学般高弹性的缓冲性,故中医学体系仍未突变。而这种体系,已阻碍了中攻滨发展,必须用实事求是的态度去检验和发展它。     

Long-term efficacy of exercise across diagnostically heterogenous mental disorders and the mediating role of affect regulation skills

BackgroundExercise interventions are efficacious in reducing disorder-specific symptoms in various mental disorders. However, little is known about long-term transdiagnostic efficacy of exercise across heterogenous mental disorders and the potential mechanisms underlying treatment effects.MethodsPhysically inactive outpatients, with depressive disorders, anxiety disorders, insomnia or attention deficit hyperactivity disorder were randomized to a standardized 12-week exercise intervention, combining moderate exercise with behavior change techniques (BCTs) (n = 38), or a passive control group (n = 36). Primary outcome was global symptom severity (Symptom Checklist-90, SCL-90-R) and secondary outcomes were self-reported exercise (Physical Activity, Exercise, and Sport Questionnaire), exercise-specific affect regulation (Physical Activity-related Health Competence Questionnaire) and depression (SCL-90-R) assessed at baseline (T1), post-treatment (T2) and one year after post-treatment (T3). Intention-to-treat analyses were conducted using linear mixed models and structural equations modeling.ResultsFrom T1 to T3, the intervention group significantly improved on global symptom severity (d = −0.43, p = .031), depression among a depressed subsample (d = −0.62, p = .014), exercise (d = 0.45, p = .011) and exercise-specific affect regulation (d = 0.44, p = .028) relative to the control group. The intervention group was more likely to reveal clinically significant changes from T1 to T3 (p = .033). Increases in exercise-specific affect regulation mediated intervention effects on global symptom severity (ß = −0.28, p = .037) and clinically significant changes (ß = −0.24, p = .042).ConclusionsThe exercise intervention showed long-term efficacy among a diagnostically heterogeneous outpatient sample and led to long-lasting exercise behavior change. Long-term increases in exercise-specific affect regulation within exercise interventions seem to be essential for long-lasting symptom reduction.