TEMPORAL ENCODING IN TRACE CONDITIONING
TEMPORAL ENCODING IN TRACE CONDITIONING
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DOI：
10.3758/bf03199929
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发表时间：
1995-05-01
期刊：
影响因子：
--
通讯作者：
MILLER, RR
中科院分区：
文献类型：
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作者：
COLE, RP;BARNET, RC;MILLER, RR
采用大鼠条件性舔抑制实验，探讨了时间在微量条件反射中的作用。在实验1中，两组大鼠暴露于CS（CS 1）与US的配对，条件下，分离CS 1偏移和US发作的刺激间间隔（ISI）为0或5秒。另外两组也暴露于相同的CS 1->US配对，ISI为0或5秒，然后接受“向后"二阶条件反射，其中CS 1紧接着是新的CS2（即，CS1-->CS2）。一个跟踪条件赤字，观察到的CS 1条件与5秒的间隙支持较少的兴奋性反应比CS 1条件与0秒的间隙。然而，CS2引起更多的条件反应，在训练组与5秒CS 1-US间隙比在训练组与0秒CS 1-US间隙。因此，CS 1-US间期对一阶和二阶条件反应有相反的影响。实验2作为实验1的感觉预处理模拟物进行。在实验2中，大鼠在CS 1-->US配对之前接受CS 1-->CS2配对（其中CS 1再次以0或5秒ISI为条件）。实验2显示了一阶和二阶条件反射之间的分离，类似于实验1中观察到的。这些结果是不兼容的观点，即不同的ISI条件下的CS的反应差异介导的关联值的差异。结果进行了讨论的时间编码假设的框架内，根据事件之间的时间关系编码在小学协会。
Conditioned lick suppression in rats was used to explore the role of timing in trace conditioning. In Experiment 1, two groups of rats were exposed to pairings of a CS (CS1) with a US, under conditions in which the interstimulus interval (ISI) that separated CS1 offset and US onset was either 0 or 5 sec. Two additional groups were also exposed to the same CS1-->US pairings with either a 0 or a 5-sec ISI, and then received ''backward'' second-order conditioning in which CS1 was immediately followed by a novel CS2 (i.e., CS1-->CS2). A trace conditioning deficit was observed in that the CS1 conditioned with the 5-sec gap supported less excitatory responding than the CS1 conditioned with the 0-sec gap. However, CS2 elicited more conditioned responding in the group trained with the 5-sec CS1-US gap than in the group trained with the 0-sec CS1-US gap. Thus, the CS1-US interval had inverse effects on first- and second-order conditioned responding. Experiment 2 was conducted as a sensory preconditioning analogue to Experiment 1. In Experiment 2, rats received the CS1-->CS2 pairings prior to the CS1-->US pairings (in which CS1 was again conditioned with either a 0 or a 5-sec ISI). Experiment 2 showed a dissociation between first- and second-order conditioned responding similar to that observed in Experiment 1. These outcomes are not compatible with the view that differences in responding to CSs conditioned with different ISIs are mediated exclusively by differences in associative value. The results are discussed in the framework of the temporal coding hypothesis, according to which temporal relationships between events are encoded in elementary associations.