Effect of intertrial interval on acquisition and extinction of a running response.

Abstract
Using a runway with a 4 x 4 design (15-sec, 2-min., 8-min., and 16-min. inter-trial intervals in training and extinction) found "significant differences among extinction running times for the four extinction groups and a sig-nificant interaction of the acquisition and extinction variables upon ex-tinction behavior . . . These findings are more or less consistent with Sheffield''s frustration-drive hypothesis but raise the question as to why frustration drive should produce slower running with an 8-min,intertrial interval than with a 16-min. interval.".
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