EVIDENCE THAT BODY IRRITATIONS OR EMOTIONS RETARD GASTRIC EVACUATION, NOT BY PRODUCING PYLOROSPASM BUT BY DEPRESSING GASTRIC MOTILITY 1

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Abstract
The effect on the motor activity of the pyloric sphincter region of emotions, or a variety of noxious bodily stimuli applied to somatic and visceral structures was detd. on trained dogs by several rather direct methods. Under these conditions, as in several previously studied, the pyloric sphincter region (antrum, sphincter, and bulb) tended to behave as a unit; in action, the sphincter was similar, not contrary, to the antrum. Emotions and noxious stimuli did not produce pylorospasm but tended to inhibit the entire sphincter region. Emotions and noxious stimuli retarded gastric evacuation. This retardation resulted from decreased antral peristalsis. The delayed evacuation was not due to pylorospasm; in fact, it developed in spite of the pyloric relaxation. The claim that pylorospasm is readily produced by emotional states or noxious bodily stimuli receives little support from this exptl. study or from a critical consideration of the clinical evidence.

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