RECOVERY OF AN OVERSHADOWED ASSOCIATION ACHIEVED BY EXTINCTION OF THE OVERSHADOWING STIMULUS
RECOVERY OF AN OVERSHADOWED ASSOCIATION ACHIEVED BY EXTINCTION OF THE OVERSHADOWING STIMULUS
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DOI：
10.1016/0023-9690(85)90023-2
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发表时间：
1985-11-01
影响因子：
1.4
通讯作者：
MILLER, RR
中科院分区：
文献类型：
--
作者：
MATZEL, LD;SCHACHTMAN, TR;MILLER, RR
报道了三项实验，其中将缺水大鼠的条件性舔抑制用作联想强度的指标。在实验1中，当浅色调复合刺激与足部电击配对时，观察到色调对光的遮蔽。在最初的复合配对后，一组受试者的音调-休克关联消失了。随后，相对于音调尚未熄灭的对照组，这些动物表现出明显更高水平的光抑制。实验 2 复制了这种效应，但未能找到证据来支持以下可能性：遮蔽音调的消退呈现可以作为光休克关联的检索线索，或者通过二阶条件作用，光休克关联实际上是在音调消退期间形成的。实验3确定实验1和2中观察到的遮蔽恢复特定于遮蔽刺激的消失而不是任何兴奋性线索的消失。总的来说，这些结果表明，对阴影刺激的衰弱反应并不代表习得失败，而是后天关联未能在行为中表现出来。
Three experiments are reported in which conditioned lick suppression by water-deprived rats was used as an index of associative strength. In Experiment 1, overshadowing of a light by a tone was observed when the light-tone compound stimulus was paired with foot shock. After initial compound pairings, the tone-shock association was extinguished in one group of subjects. Subsequently, these animals demonstrated significantly higher levels of suppression to the light relative to a control group in which the tone had not been extinguished. Experiment 2 replicated this effect while failing to find evidence to support the possibilities that extinction presentations of the overshadowing tone act as retrieval cues for the light-shock association, or that, via second-order conditioning, the light-shock association is actually formed during extinction of the tone. Experiment 3 determined that the recovery from overshadowing observed in Experiments 1 and 2 was specific to the extinction of the overshadowing stimulus rather than the extinction of any excitatory cue. Collectively, these results suggest that the debilitated response to an overshadowed stimulus does not represent an acquisition failure, but rather the failure of an acquired association to be manifest in behavior.