Response strength in multiple periodic and aperiodic schedules

Responding in multiple periodic and aperiodic schedules of equal mean reinforcement rate was examined during extinction, satiation, and in the presence of various free-food schedules. In Experiments I and II, pigeons were trained on multiple variable-interval–fixed-interval schedules. Decreases in the rate of responding due to extinction, satiation, or food schedules were approximately equal regardless of the temporal pattern of reinforcer presentation. In Experiment III, pigeons responded on a two-component multiple schedule in which each component was a two-member homogeneous response chain terminating in a fixed-interval schedule during one component and in a variable-interval schedule during the other. The length of both terminal links was varied over a series of conditions. Initial-link responding in the fixed-interval component was reduced more by increasing terminal-link length than was initial-link responding in the variable-interval component. However, no differences in resistance to satiation and extinction were obtained across the fixed and variable components. If the relative decrease in responding produced by satiation and extinction is used as an index of the “value” of the conditions maintaining responding, then these data suggest that fixed and variable schedules of equal mean length are equally valued. This conclusion, however, is not consistent with findings of preference for variable over fixed schedules obtained in studies using concurrent-chain procedures.     

Parallel ocular and manual tracking responses to a continuously moving visual target

Continuous ocular and manual tracking of the same visual target moving horizontally in sinusoids at 0.75 Hz was measured by lag, RMS Error, and Gain. The best measures of accuracy of tracking, error and lag, were remarkably similar in the two systems and were affected similarly by presence of a background and changes in predictability of target movement. Details of within-system performance varied despite the over-all parallels. Gain was different in adjustment of proportion of saccadic to pursuit movement was affected by the presence of the hand, even though this did not affect tracking accuracy. The over-all parallel of response adjustment suggests that a suprasystem decision-maker sets general response goals and each motor system adjusts output details to match these goals.     

《古兰经》的伦理道德思想(续)

三、敬畏 敬畏是一种宗教美德,《古兰经》用它来确定人与人、人与造物主之间的关系。“敬畏”一词及其派生词大都出现在《古兰经》中有关道德和社会主张的经文中。所谓“敬畏”就是要人类谨防那些使真主恼怒和损人害己的行为。因为“敬畏”一词本意为保护自己。人之所以保护自己,是因有可惧怕的东西存在。安拉是最值得惧怕的,所以因安拉而保护自己是特别重要的。既然惧怕,就     

《古兰经》的伦理道德思想(续)

七、公正 伊斯兰教的理想之一就是责成其信徒要丢掉一切与自身利害有关的考虑,主持人间公道。安拉说:“信教的人们!你们应主持公正,应为安拉而作见证,即使不利于自身,或自己的父母和亲属。不论被见证者是富人或贫人,那安拉是最宜于对付他们的。你们不要徇私,以免偏离公正;如果你们歪曲事实,或拒绝作证,那安拉对你们的作为将是一清二楚。”(4:135)     

Structuring of early reaching movements: a longitudinal study

Reaches, performed by 5 infants, recorded at 19 weeks of age and every third week thereafter until 31 weeks of age, were studied quantitatively. Earlier findings about action units were confirmed. At all ages studied, movements were structured into phases of acceleration and deceleration. Reaching trajectories were found to be relatively straight within these units and to change direction between them. It was also found that at all ages, there was generally one dominating transport unit in each reach. The structuring of reaching movements changed in four important ways during the period studied. First, the sequential structuring became more systematic with age, with the dominating transport unit beginning the movement. Second, the duration of the transport unit became longer and covered a larger proportion of the approach. Third, the number of action units decreased with age, approaching the two-phase structure of adult reaching. Finally, reaching trajectories became straighter with age.     

认知风格与教学策略(节译)

一般地说,认知风格可以被理解为个人感知、组织以及评价信息的独特方式。然而,除此之外,本文要论及的四项系列研究运用了两种量表,它们反映了对认知风格的不同而独特的解释。一种量表是迈尔斯—布立格斯类型量表(Myers—Briggs Type lndlcator),这是一套著名的量表,它是以荣格(Jungian)的人格理     

呼图白集(续六)

朱马达·阿黑赖第一讲赞美安拉——造化所有万物的主,开天辟地的主,布施给养的主。巢中群鸟赞他清净,各路王侯颂他崇高。赞主清净,他是崇高普施的主,其拥有之财富不因博施而罄绝。我赞美安拉清净玄高,赞主会持续给