INCREASE OF PLASMA 17-HYDROXYCORTICOSTEROIDS BY CEREBRAL CORTICAL AND AMYGDALOID STIMULATION IN THE CAT

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Abstract
SUMMARY: Behavioural arousal and fear may be induced by electrical stimulation of the cingulate and the temporo-occipital cortex and the amygdala in the cat. The influence of these regions on the plasma level of 17-hydroxycorticosteroids (17-OHCS) has been studied. To eliminate the possibility that any increase observed was not secondary to arousal or fear caused by environmental factors or the blood sampling, the experiments were carried out under anaesthesia. Increase of the plasma level of the 17-OHCS was produced by stimulation of twenty-five points in the following three regions: (a) the anterior cingulate cortex; (b) the lower portion of the posterior ecto- and suprasylvian gyri of the temporo-occipital cortex, and (c) the amygdala. The increase amounted up to 560% of the control values. The response was obtained during light anaesthesia only. Stimulation of thirty-seven points in other cortical regions and in the internal capsule caused no significant change in the plasma steroid level.

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