Conditioned [corrected] stimulus informativeness governs conditioned stimulus-unconditioned stimulus associability.

IF 1.3 4区 心理学
Ryan D Ward, C R Gallistel, Greg Jensen, Vanessa L Richards, Stephen Fairhurst, Peter D Balsam
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引用次数: 36

Abstract

In a conditioning protocol, the onset of the conditioned stimulus ([CS]) provides information about when to expect reinforcement (unconditioned stimulus [US]). There are two sources of information from the CS in a delay conditioning paradigm in which the CS-US interval is fixed. The first depends on the informativeness, the degree to which CS onset reduces the average expected time to onset of the next US. The second depends only on how precisely a subject can represent a fixed-duration interval (the temporal Weber fraction). In three experiments with mice, we tested the differential impact of these two sources of information on rate of acquisition of conditioned responding (CS-US associability). In Experiment 1, we showed that associability (the inverse of trials to acquisition) increased in proportion to informativeness. In Experiment 2, we showed that fixing the duration of the US-US interval or the CS-US interval or both had no effect on associability. In Experiment 3, we equated the increase in information produced by varying the C/T ratio with the increase produced by fixing the duration of the CS-US interval. Associability increased with increased informativeness, but, as in Experiment 2, fixing the CS-US duration had no effect on associability. These results are consistent with the view that CS-US associability depends on the increased rate of reward signaled by CS onset. The results also provide further evidence that conditioned responding is temporally controlled when it emerges.

条件刺激信息性支配条件刺激-非条件刺激的联想性。
在条件反射方案中,条件刺激([CS])的开始提供了关于何时期望强化(非条件刺激[US])的信息。在CS- us区间固定的延迟条件反射范式中,CS有两个信息源。第一个取决于信息的广泛性,即CS的发作在多大程度上缩短了下一次美国发作的平均预期时间。第二种方法只取决于被试对固定时间间隔(时间韦伯分数)的描述有多精确。在三个小鼠实验中,我们测试了这两种信息来源对条件反应获得率(CS-US联想性)的不同影响。在实验1中,我们表明联想性(与习得相反的试验)与信息量成比例地增加。在实验2中,我们发现固定US-US间隔或CS-US间隔或两者的持续时间对联想性没有影响。在实验3中,我们将改变C/T比率所产生的信息增加等同于固定CS-US间隔的持续时间所产生的信息增加。联想性随信息量的增加而增加,但与实验2一样,固定CS-US持续时间对联想性没有影响。这些结果与CS- us联想性取决于CS发作时奖赏率的增加的观点是一致的。结果还提供了进一步的证据,证明条件反应在出现时是暂时受控制的。
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来源期刊
自引率
23.10%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Journal of Experimental Psychology: Animal Learning and Cognition publishes experimental and theoretical studies concerning all aspects of animal behavior processes.
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