Some hormonal responses to electrical self-stimulation in the Macaca mulatta

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Abstract
Electrical self-stimula-tion through electrodes in the lateral preoptic region of 5 Macaca mulatta increased plasma and urinary 17-OH corticoids and urinary epinephrine and decreased urinary estrogens. Plasma butanol-ex-tractable iodine and urinary nor epinephrine were usually increased as well but these responses were less consistent. These endocrine changes resemble most the hormonal responses to emotional arousal, and thus indicate that the endocrine state of self-stimulating monkey is more like that of an excited animal than a quieted one.