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EFFECTS OF CONTRAST IN STIMULATION ON GASTROINTESTINAL MOTILITY.
INDIANA UNIV BLOOMINGTON
In a recent report AD-610 180 evidence was presented indicating that variations in visual and auditory stimulation have a significant effect on gastrointestinal motility, as measured with surface electrodes. In the present study, the interest was in determining the effects of contrast in stimulation, or in other words, the effects of the immediately preceding level of stimulation on the g.i. response to a moderate level of stimulation. It was hypothesized that a change to a moderate level of stimulation would result in a decrease in g.i. motility below base-line level for a group that was responding at a high level to high stimulation, and an increase in level of responding for a group that was responding at a previously low level to low stimulation. Previous research has demonstrated that other somatic variables, i.e., autonomic responses and skeletal muscle responses, have shown this contrast effect. The intent of the present study was to determine whether or not the g.i. system shows this same effect, which appears to be analogous to the overshoot phenomenon displayed by most negative feedback systems. Author
Technical rept. no 14,