Gastric secretory response to amygdaloid or hypothalamic stimulation in monkeys

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Abstract
Electrical stimulation of amygdala or hypothalamus produced defense reactions, marked increases of plasma 17-hydroxycorticosteroids (17OH-CS), and significant inhibition of gastric acid outputs in conscious macaques equipped with gastric fistulas. Pepsin outputs decreased less during brain stimulation. In the 4 hr. following central stimulation, gastric acid output did not rise significantly above prestimulation values despite increased plasma 17OH-CS. These data are evidence for including increases of plasma 17OH-CS and decreases of gastric acid output as visceral components of the defense reaction in conscious macaques. Under the conditions of these experiments, there was no evidence for an "adrenal phase" of gastric acid stimulation.