MECHANISMS RESPONSIBLE FOR REDUCED CONTEXTUAL CONDITIONING WITH MASSED UNSIGNALED UNCONDITIONAL STIMULI
MECHANISMS RESPONSIBLE FOR REDUCED CONTEXTUAL CONDITIONING WITH MASSED UNSIGNALED UNCONDITIONAL STIMULI
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DOI：
10.1037/0097-7403.19.2.121
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发表时间：
1993-04-01
期刊：
影响因子：
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通讯作者：
YOUNG, SL
中科院分区：
文献类型：
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作者：
FANSELOW, MS;DECOLA, JP;YOUNG, SL
无信号电击的集中呈现比分布式呈现对上下文线索的条件性冻结更少。与基于知觉-防御-恢复理论对学习缺陷的描述一致，集体休克缺陷通过预先暴露于电击或条件性语境而减弱。这一公式也被成功地应用于在放置后立即给予单一电击时发生的条件反射缺陷。对手-过程理论没有得到两个发现的支持：(A)休克前暴露既没有增加赤字，也没有减少阿片类拮抗剂，以及(B)大量休克的无条件反应更大。与这一效应是冰冻特有的性能人工制品的说法不一致，集中休克缺陷在第二个条件作用指标中是明显的。
Massed presentation of unsignaled shock results in less conditional freezing to contextual cues than do distributed presentations. Consistent with an account of the learning deficit based on the perceptual-defensive-recuperative theory, the massed-shock deficit was attenuated by preexposure to shock or the conditioning context. This formulation was also successfully applied to the deficit in conditioning that occurs when a single shock is given immediately after placement in a context. Opponent-process theory was not supported by 2 findings: (a) The deficit was neither enhanced by shock preexposure nor reduced by an opioid antagonist, and (b) unconditional reactions were greater with massed shock. Inconsistent with the suggestion that the effect is a performance artifact specific to freezing, the massed-shock deficit was apparent for a 2nd measure of conditioning.