Extinction of the human eyelid CR as a function of presence or absence of the UCS during extinction.

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Abstract
Extinction of the eyelid CR [conditioned response] in human Ss [subjects] was investigated in the context of a masking situation (probability learning). Ss that has the UCS [unconditioned stimulus] present during extinction, either alone on 1/2 of the trials or delayed on 1/2 of the trials, were significantly more resistant to extinction than Ss than did not have the UCS during extinction. This difference was shown to be interpretable in terms of a difference in drive level (D) only, without the necessity of assuming a difference in the rate of development of inhibitory effect (In) of nonreinforcement. When drive is maintained the extinction of the eyelid CR proceeds in relatively slow graudal manner.

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