Abstract
The purpose of this study was to determine the effects of contrast in stimulation, or in other words, the effects of the immediately preceding level of stimulation on the gastrointestinal response to a moderate level of stimulation. As was hypothesized, a change to a moderate level of stimulation resulted in a decrease in g.i. motility for a group of 20 male Ss who were responding at a high level to high stimulation, and an increase in level of responding for another group of 20 male Ss who were responding at a previously low level to low stimulation. For various autonomic measures there is an immediate reversal in relative level of responding with change in level of stimulation, whereas for g.i. motility there is a 2- to 3-min. increase in activity for both groups following any change in stimulation and then a reversal in level of g.i. responding.
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