Intertrial stimuli and generalization of the conditioned eyelid response.

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Abstract
A total of 290 human Ss [subjects] participated in 2 experiments designed to investigate the effect of variation of the similarity between the intertrial stimulus (ITS) and the CSs upon generalization of the eyelid CR. Employing simple auditory stimuli, several effects of a proximal ITS were noted including (a) sharpening of the gradient, (b) skewing of the gradient away from the ITS, and an overall depression of the gradient with increases in proximity. These results were predicted from a theory which assumes that inhibition generalizes from the ITS in the same way in which inhibition generalizes from stimuli which have received systematic nonreinforcement. Possible sources of ITS inhibition were discussed.

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