Kaye H, Mackintosh N J
University of Cambridge, U.K.
Q J Exp Psychol B. 1990 May;42(2):113-34.
In four experiments rats received pairings of one auditory CS and mild shock in one context and of a second auditory CS and shock in a second context. When tested with one of these CSs in the context in which it had never been experienced, they consistently showed enhanced levels of suppression. In one of these experiments, suppression was measured over 15-sec intervals throughout a 90-sec long CS. A change of context resulted in an increased level of suppression at all points throughout the CS, a finding which does not encourage the belief that it was due to an increase in unconditioned suppression at the onset of the CS. Another experiment provided equally little support for an alternative account in terms of increased arousal. The results therefore suggest that a change of context can increase the level of conditioned suppression elicited by a CS paired with mild shock. Two final experiments employing the same CSs and contexts, however, found no evidence that a change of context had any effect at all on the performance of an appetitively conditioned response.
在四项实验中，大鼠在一种情境下接受一种听觉条件刺激（CS）与轻度电击的配对，在另一种情境下接受另一种听觉CS与电击的配对。当在其从未经历过的情境中用这些CS之一进行测试时，它们始终表现出增强的抑制水平。在其中一项实验中，在长达90秒的CS期间以15秒的间隔测量抑制。情境的改变导致在整个CS期间的所有时间点抑制水平都增加，这一发现并不支持认为这是由于CS开始时非条件抑制增加的观点。另一项实验同样几乎没有为基于唤醒增加的另一种解释提供支持。因此，结果表明情境的改变可以增加与轻度电击配对的CS所引发的条件抑制水平。然而，最后两项使用相同CS和情境的实验没有发现任何证据表明情境的改变对食欲性条件反应的表现有任何影响。
