Rate of extinction of the conditioned eye blink was investigated as a function of maintained drive level in extinction and amount of stimulus change from conditions of acquisition to those of extinction. 50 Ss were given 90 acquisition trials under a partial reinforcement schedule in which the UCS was either delayed or omitted on half the trials. Half of the Ss conditioned under each procedure were given 20 extinction trials with the UCS delayed and half were extinguished with the UCS omitted. There was no evidence for an effect of either drive or amount of stimulus change determining rate of extinction.
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