Overshadowing by fixed- and variable-duration stimuli
Overshadowing by fixed- and variable-duration stimuli
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DOI：
10.1080/17470218.2014.960875
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发表时间：
2015-03-04
影响因子：
1.7
通讯作者：
Jennings, Domhnall J.
中科院分区：
文献类型：
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作者：
Bonardi, Charlotte;Mondragon, Esther;Jennings, Domhnall J.
两个实验研究了刺激的时间分布形式对其产生遮蔽效应的能力的影响。遮蔽刺激的持续时间相同的每次审判，或从指数分布的平均持续时间相同的固定刺激的可变持续时间。这两个实验提供的证据表明，一个可变的持续时间的刺激是不太有效的比固定持续时间的线索在遮蔽条件反射的目标条件刺激（CS），而且，这种效果是独立的遮蔽CS是否是固定的或可变的。这里提出的研究结果是一致的想法，CS和无条件刺激（US）之间的关联的强度是，在一定程度上，由CS的时间分布形式决定。这些结果进行了讨论的条件反射和定时的时间积累和审判为基础的理论。
Two experiments investigated the effect of the temporal distribution form of a stimulus on its ability to produce an overshadowing effect. The overshadowing stimuli were either of the same duration on every trial, or of a variable duration drawn from an exponential distribution with the same mean duration as that of the fixed stimulus. Both experiments provided evidence that a variable-duration stimulus was less effective than a fixed-duration cue at overshadowing conditioning to a target conditioned stimulus (CS); moreover, this effect was independent of whether the overshadowed CS was fixed or variable. The findings presented here are consistent with the idea that the strength of the association between CS and unconditioned stimulus (US) is, in part, determined by the temporal distribution form of the CS. These results are discussed in terms of time-accumulation and trial-based theories of conditioning and timing.