工作时间与工作绩效的非线性关系：一项元分析

基于42篇文献的64项独立研究, 总样本量为22843人的数据, 对工作时间与工作绩效的非线性关系进行了元分析。结果发现：(1)工作时间与任务绩效、关系绩效之间存在显著的倒U型关系; (2)国家类型的调节作用显著：相对于西方欧美国家, 工作时间与任务绩效、关系绩效的倒U型关系在中国更为显著; (3)产业类型的调节作用显著：相对于劳动、资本密集型产业, 工作时间与任务绩效的倒U型关系在知识密集型产业中更为显著; (4)年龄的调节作用显著：相对于高年龄水平, 工作时间与任务绩效的倒U型关系在低年龄水平群体中更为显著; (5)性别的调节作用显著：相对于低男性比例, 工作时间与关系绩效的倒U型关系在高男性比例群体中更为显著。结果不仅基于元分析厘清了工作时间与工作绩效的倒U型关系效应, 而且为劳动法中工时规定(例如周均工作时间不超过44小时)的合理性提供了科学依据, 警示组织注意工作时间对工作绩效的“过犹不及”效应。     

Subjetividad,coherencia, contexto y estilo en la comprensión de un discurso complejo

Resumen

Con objeto de profundizar en algunos aspectos que hacen de la perspectiva textual un factor de la coherencia del discurso, se consideró la posibilidad de que, cuando concurre una alta complejidad retórica, la manipulación de la identidad del enunciante afectaría a la comprensión de los Ss, siempre que se mantuviera la facilitación contextual.

Para probar esta hipótesis se elaboraron dos diseños experimentales. En el primero, un factorial 3 x 2, en el que los materiales eran fragmentos narrativos, se emplearon como medidas las respuestas a un cuestionario de comprensión, los tiempos de lectura, los tiempos de reacción a los ítems del cuestionario, el tiempo de demora en la respuesta, la valoración de la dificultad del texto y la atribución de textualidad. En el segundo diseño se presentaron, a tres grupos seleccionados al azar, frases independieras y aleatorizadas tomadas de los fragmentos del diseño anterior. En este caso se registraron las tres medidas temporales ya mencionadas y la identificación del enunciante. En total participaron 216 estudiantes de 3.° de BUP, mitad hombres y mitad mujeres, cuyas edades oscilaban entre dieciséis y veinte años. En ambos casos los aparatos empleados fueron una llave vocal conectada a un proyector de diapositivas, cuyo flujo era controlado por un programador de secuencias temporales con resolución de milisegundos.

En el primer diseño nuestra hipótesis se confirmo (α-.01) para uno de los grupos (Facilitación contextual y constancia de la identidad del enunciante), al tiempo que la demora covarió con la atribución de textualidad (α =.01 y α=.05, según los grupos). En el segundo diseño no se encontraron diferencias significativas. Estos resultados son interpretados como indicios de la existencia de esquemas estilísticos. Además se discuten distintos aspectos de la función pragmática del estilo y de las características de su procesamiento.     

Un nuevo enfoque sobre la esquizofrenia

RESUMEN

El entrenamiento en habilidades sociales y el programa de terapia familiar están siendo evaluados en un proyecto de investigación que incluye un tratamiento comparativo con terapia de movilización. En este tipo de terapia los pacientes, asignados al azar y con una esquizofrenia documentada, practican relajación, footing, reducción del estrés estrés, actividades manuales y terapia creativa. Se ha intentado en este artículo hacer una primera aproximación a un enfoque de tratamiento psicosocial de la esquizofrenia con base empírica. Bajo la optimista pretensión teórica de que los pacientes esquizofrénicos tratados tienen capacidad para aprender; que las actitudes y sentimientos familiares pueden cambiar en forma positiva y el ambiente donde se desenvuelven puede diseñarse para suspender la diátesis, mediatizada biológicamente.     

Anorexia Nervosa,Buliminarexia, and Bulimia

No abstract available for this article.     

Individualized Challenge Point Practice as a Method to Aid Motor Sequence Learning

We conducted two studies to investigate if and how: (1) the rate of skill acquisition was related to motor performance at retention of a serial RT task (Study 1); and (2) whether rate of skill acquisition and baseline performance could be used to design schedules of practice related to contextual interference (CI) to enhance motor learning (Study 2). In Study 1, a slower rate of skill acquisition of repeating sequences in practice was related to faster response times at retention. Based on performance in Study 1, three levels of individualized CI were created for Study 2. Compared to low and moderate levels of CI, the higher CI practice condition led to faster response times in retention. We conclude that an individualized ‘challenge point’, which generates high CI enhances motor learning by optimizing challenge.     

The Utility of Connectionism for Motor Learning: A Reinterpretation of Contextual Interference in Movement Schemas

Using the general framework of schema theory, and building on it, the present article takes a connectionist approach to motor learning and to contextual interference effects. These phenomena were simulated in an exploratory manner in neural networks. The outcome closely reflects previous research with humans. In a simulated ballistic movement task, networks performed worse during practice but showed better transfer when target movement distances were presented in a random rather than a blocked fashion. Connectionism provides a parsimonious account of the effect in terms of properties inherent in the parallel distributed network.     

A Bayesian Approach to More Stable Estimates of Group-Level Effects in Contextual Studies

Multilevel analyses are often used to estimate the effects of group-level constructs. However, when using aggregated individual data (e.g., student ratings) to assess a group-level construct (e.g., classroom climate), the observed group mean might not provide a reliable measure of the unobserved latent group mean. In the present article, we propose a Bayesian approach that can be used to estimate a multilevel latent covariate model, which corrects for the unreliable assessment of the latent group mean when estimating the group-level effect. A simulation study was conducted to evaluate the choice of different priors for the group-level variance of the predictor variable and to compare the Bayesian approach with the maximum likelihood approach implemented in the software Mplus. Results showed that, under problematic conditions (i.e., small number of groups, predictor variable with a small ICC), the Bayesian approach produced more accurate estimates of the group-level effect than the maximum likelihood approach did.     

The Rôle of the Acquired Distinctiveness of Cues in the Acquisition of a Motor Skill in Children

The fears of 133 boys and girls aged 7 to 19, classified as educable mentally retarded (EMR), trainable mentally retarded (TMR), and specific learning disabled (SLD), were ascertained through self-report data and compared with those of 106 normal children aged 6 to 12. Similar developmental trends were found in all groups, with younger children reporting more unrealistic fears than older children. When mental age was calculated for the EMR and TMR children, their developmental trends closely approximated those of the normal children. In general, exceptional children were found to have a much wider range and a greater number of fears than normal children. Most fears were found to be realistic, learned, and dependent upon the child's intellectual and maturational level.     

Negotiating faith on the Coventry Road: British-Muslim youth identities in the ‘third space’

This article, which arises from three years of ethnographic fieldwork, explores the negotiation of faith, place and social identity amongst British-Muslim youth in one inner-city community in Birmingham, UK. Narratives drawn from fieldwork are brought into a critical dialogue with theoretical discourse about the nature of culture, the built urban environment, youth identities and contextualised religious discourse within the British-Muslim community. The article suggests that a dynamic definition of culture as an open and ongoing process of meaning-making and the utilisation of ‘third space’ thinking are needed to adequately explore the multifaceted contextual religious discourse of British-Muslim youth. The article seeks to answer a key question: how do urban British-Muslim youth negotiate faith and meaning in a society that increasingly questions their presence and what might their experience have to teach wider society about the impact that contemporary urbanism has on the articulation of personal, political and religious identity?