非条件刺激
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USC unconditional stimulus 非条件刺激
In Pavlov's conditioning experiments with dogs, the presentation of food was the unconditional stimulus because it evoked the natural response of salivation in preparation for eating.
在帕夫洛夫的空调实验狗，介绍食品是无条件的，因为它刺激诱发的自然反应，流涎，准备进食。
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