Thyroid and Adrenal Medullary Function in Chronic “Executive” Monkeys

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Abstract
Thyroid hypersecretion measured by increases in serum PBI (protein-bound iodine), serum BEI (butanol extractable iodine) and decreases in I131 excretion is described in an "executive" monkey subjected to chronic avoidance activity. In a group of 5 such executive monkeys a rise (p < .01) in serum PBI occurred at the 60th working day when compared to a control group of animals. Adrenal medullectomy did not greatly influence this pattern of PBI response even though a striking decrease (p<.01) in free adrenaline (epinephrine) excretion and increase (p <.01) in free noradrenaline (norepinephrine) excretion occurred after adrenal medullectomy. The significance of these findings is discussed in terms of their relationship to psychic influences on thyroid hormone secretion.

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