对选择注意中负启动效应的研究

以数字命名作业为任务对选择注意中的负启动效应作了探讨,发现在强调反应正确性时,有负启动效应产生;若强调反应速度,则表现出正启动效应。干扰项的活动状态是启动效应性质的决定因素。研究结果还验证了扩散抑制及其扇形效应的构想,并支持注意后期选择理论。     

Personality factors of individuals who survive traumatic experiences without professional help

This is a study of the personality resources that enable certain individuals to cope successfully with traumatic experiences without planned psychotherapeutic intervention. A survey of 40 trauma-surviving respondents reveals some common positive developmental and psychosocial factors. Also, five cases are described who experienced serious trauma, three of them living successful lives and two remaining disabled. The biological predisposition and the specific interaction of ones nature and nurture leading toward resolution of traumatic experiences are discussed. Individuals who have survived Posttraumatic Stress Disorder should be studied further within a psychobiological framework.     

上海地区中学教师心态之初步调查

本文采用问卷调查的形式,研究了上海中学教师的进修心态。调查表明．教师认为进修能够增加知识和提高教学水平,进修时心情比较愉快．即使碰到心情不好也能坚持去进修;听课时能记笔记,希望多讲少考．多采取开卷考试,在阅卷考试时．希望考前复习的“透明度”越高越好;教师对其注意力、记忆和理解力的自我评价比较积极,他们的进修动机主要是满足个人的求知欲和提高教学水平。     

Contrast, induction, facilitation, suppression, and conservation

Ten rats received all of their water in daily 1-hr sessions. Following a baseline phase in which lever and water spout were freely available throughout each session, subjects were trained to press the lever for water on mixed schedules composed of two alternating components. Each component gave access to water for a fixed cumulation of drinking time every time the rat cumulated a fixed amount of lever-pressing time. Changes in one component produced contrast and induction effects, both positive and negative, with respect to both lever pressing and drinking in the unchanged component. All schedules facilitated lever pressing relative to baseline. All schedules suppressed drinking relative to baseline, even though contingency sessions allowed ample time to perform the baseline amount of drinking. The entire pattern of results was predicted in quantitative detail by assuming that the total amount of a dimension apportioned to lever pressing and drinking is conserved between baseline and contingency sessions. Conservation theory was shown to predict several effects produced by simple fixed-ratio schedules, and was compared favorably with probability-differential (Premack, 1971) and response-deprivation (Timberlake and Allison, 1974) theory.     

Local contrast and Pavlovian induction

Two experiments examined the effects of number and similarity of stimuli on local contrast. In the first experiment, local contrast effects differed in magnitude as a function of the similarity among stimuli; greater positive local contrast appeared when stimuli were less similar, though this effect sometimes reversed for very dissimilar stimuli. In the second experiment, both positive and negative local contrast appeared transiently during the course of training a discrimination including two quite dissimilar stimuli. When two new stimuli were added, both effects reappeared in several cases. The effects remained when the discrimination was rendered more difficult by substituting a new stimulus very similar to one of the original pair. These and other data suggest that local contrast depends on the same factors that produce Pavlovian induction; in the absence of an alternative account, Pavlov's interpretation may be useful in suggesting further research that will help identify the mechanisms involved in both classical and operant discrimination learning.     

Generalization peak shift in rats under conditions of positive reinforcement and avoidance

Rats were trained to discriminate between two click frequencies. One frequency was associated with either variable-interval food reinforcement (Experiment 1) or free-operant avoidance (Experiment 2). The other frequency was associated with the absence of food in Experiment 1 and the absence of shock in Experiment 2. On a click frequency generalization test, the rats in both experiments showed positive peak shift with the shape of the relative gradients being very similar. This is the first reported instance of peak shift in rats when responding was maintained by an avoidance contingency. Nondifferentially trained controls showed that this shift was due exclusively to associative processes, with nonassociative stimulus factors in themselves apparently making no contribution to increased rates at particular stimulus values. These results show the comparability of appetitive and aversive control and support the position that gradient differences do not result from approach versus avoidance per se.     

Letter to a genetic counselor

The author describes her personal experience terminating a pregnancy after receiving an abnormal amniocentesis result: While still waiting for the results, she and her husband attempted to deny the importance of the pregnancy, an approach which they subsequently regretted. When they received the abnormal result, they found themselves able to make necessary decisions quickly, despite being in shock. It then took some time before they realized what a major loss they had actually suffered. The painful aftermath included accepting emotional responsibility for their decision to abort, as well as explaining that difficult decision to their older children. Thoughts of a possible subsequent pregnancy could not be faced at once. Over time, the author found the support of friends and colleagues, and even of a support group, to be invaluable. All in all, the entire experience was more painful than she would have predicted, and she hopes that this account will prove helpful both to genetic counselors and to other patients who receive abnormal results from prenatal diagnosis. A list of suggested readings is appended.Rose Green is a pseudonym.     

Behavioral neuropsychology: Past,present, and future direction with organically based affect/mood disorders

Affective/mood disturbances have been widely described in association with central nervous system dysfunction. There have been multiple divergent viewpoints regarding the origin of these disorders, however. This is not surprising, as theories evolve in relation to our degree of technological advancement. This review describes the evolution of some of these views, and discusses the advantages of behavioral neuropsychology as an effective approach to assessment/treatment in this context. Although there have been few articles published describing the use of behaviorally based approaches to treat these disorders, it is thought that this approach shows promise, particularly when combined with information based on neuropsychological assessment data. Future directions for the continued evolution of this field are outlined.     

A confirmatory evaluation of the profile of mood states: Convergent and discriminant item validity

The Profile of Mood States was administered to samples of 182 college males, 179 college females, and 257 prison inmates. College males and females did not differ significantly from each other in terms of scale elevation but differed from prison inmates on all scales except Fatigue-Inertia. The college samples differed from the published normative college samples, suggesting the importance of using local norms. A confirmatory item factor analysis suggested convergent item validity with the scoring key and similarity of structure across samples. Discriminant item validity, however, suggested that a smaller number of mood scales would offer a more justifiable interpretation of this inventory.This study was supported by the Alberta Hospital Edmonton, the Solicitor General of Canada, and Social Sciences and Humanities Research Council of Canada Grant 410-80-0576-XI.     

Contrast and induction in multiple schedules of discrete-trial concurrent reinforcement

Three pigeons were exposed to two-key discrete-trial concurrent schedules of reinforcement. Red and white key colors alternated irregularly and the assignment of reinforcers depended on key color. The red-key schedules were held constant, with the scheduled relative frequency of reinforcement for left-key pecks set at 0.75, while the white-key schedules varied. When the location of white-key reinforcement was changed from one side to the other, while its overall frequency was constant, red-key choices shifted in the same direction as white-key choices, an induction effect. When the overall frequency of white-key reinforcement was changed while its location remained constant, red key choices shifted in a direction opposite to white-key choices, a contrast effect. Both induction and contrast effects were clearer when the overall frequency of red-key reinforcement was reduced. These data demonstrate that the allocation of responding may exhibit schedule interaction effects similar to those commonly reported for response rate.