Abstract
It has been found that nonreinforced preexposure to the to-be-conditioned stimulus results in a decrement in performance during the acquisition phase of a classical defensive leg response conditioning procedure. The present study shows that: this decrement is a function of the frequency of preexposure; the size of the decrement remains constant over 4 days of acquisition training; the decrement as a function of preexposure is not significant during extinction.

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