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Subjects habituated to a mild stimulus failed to have GSRs upon the intrusion of a “novel” mild intramodal stimulus. However, an intruding intermodal stimulus of approximately the same intensity caused large GSRs. These results support an explanation based on expectancy or the “neuronal model” of Sokolov, provided suitable allowance is made for changes in specificity of the model as a result of variations in the experimental situation.
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Houck et al. (1969) studied this question.