Variations in unconditioned stimulus processing in unblocking
Variations in unconditioned stimulus processing in unblocking
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DOI：
10.1037/0097-7403.31.2.155
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发表时间：
2005-04-01
期刊：
影响因子：
--
通讯作者：
Kenmuir, C
中科院分区：
文献类型：
--
作者：
Holland, PC;Kenmuir, C
三个实验研究了食欲解除过程中，食欲值下降影响学习的机制。通过省略2-蔗糖序列（食物-食物或食物-蔗糖）的第2个来实现向下移动。正常大鼠的表现进行了比较，与中央杏仁核，这被认为是干扰事件处理的增强神经元引起的损害的大鼠。结果表明，在正常大鼠中，第二标记的缺失增强了对第一标记的加工，而不是对条件刺激的加工，损毁中枢核团可消除这种增强。强化错误信号在条件反射中的作用进行了讨论。
Three experiments examined the mechanisms by which downward shifts in reinforcer value influence learning in appetitive unblocking procedures. The downward shift was accomplished by omitting the 2nd of a 2-reinforcer sequence (food-food or food-sucrose). Performance of normal rats was compared with that of rats with lesions of the central nucleus of the amygdala, which are thought to interfere with surprise-induced enhancements of event processing. The results suggested that, in normal rats, omission of the 2nd reinforcer enhanced processing of the 1st reinforcer rather than processing of the conditioned stimuli and that lesions of the central nucleus eliminated this enhancement. The roles of reinforcement error signals in conditioning are discussed.