Time, Trials, and Extinction
Time, Trials, and Extinction
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DOI：
10.1037/xan0000125
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发表时间：
2017-01-01
影响因子：
1.3
通讯作者：
Andrew, Benjamin J.
中科院分区：
文献类型：
--
作者：
Harris, Justin A.;Andrew, Benjamin J.
四个实验考察了条件刺激下非强化暴露次数和总持续时间对巴甫洛夫条件反射消退的影响。大鼠首先在具有多个CSs的杂志方法范式中进行训练，每个CSs与非条件刺激（US）在可变CS-US间隔上配对。在随后的消退过程中，不同的CS在其消退试验的次数和长度上有所不同，但在暴露的总持续时间上是匹配的（例如，一个CS每次有20次试验，平均时长为5秒；另一个CS每次有5次试验，平均时长为20秒）。在每种情况下，每次试验次数越多，CS的灭绝进程就越快。事实上，在试验次数匹配但每次试验持续时间不同的CSs之间，灭绝率没有差异，这表明暴露的持续时间对灭绝没有影响。我们讨论了这些发现对基于试验和基于时间的条件作用理论的影响。
Four experiments investigated the effect of number of trials and total duration of nonreinforced exposure to the conditioned stimulus (CS) on extinction of Pavlovian conditioning. Rats were first trained in a magazine approach paradigm with multiple CSs, each paired with the unconditioned stimulus (US) on a variable CS-US interval. During subsequent extinction, CSs would differ in the number and length of their extinction trials but would be matched for the total duration of exposure (e.g., 1 CS would have 20 trials per session with a mean length of 5 s; another CS would have 5 trials per session with a mean length of 20 s). In each case, extinction proceeded more quickly for the CS given more trials per session. Indeed, there was no difference in rate of extinction between CSs that were matched on number of trials but differed on the duration of each trial, indicating that duration of exposure has no effect on extinction. We discuss the implications of these findings for trial-based and time-based theories of conditioning.