. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. K. LISSAK AND E. ENDROCZI 299 in experiments with depth electrodes that stimulation of mesencephalic reticular formation, posterior hypothalamus including the mamillary bodies and the intralaminar nuclei of the thalamus activates the pituitary- adrenocortical system. This can be checked directly by estimating the corticoid content of the blood in the adrenal li S 12 i6 20 Ih 2S iZ 36 W 'i'<Cm ^ 0 0 n: Cpdf- CpdaCpji fioH- ' ' nroaestet^one pro(jt Fig. Effect of stimulation ot ainygdale and pyrito
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. K. LISSAK AND E. ENDROCZI 299 in experiments with depth electrodes that stimulation of mesencephalic reticular formation, posterior hypothalamus including the mamillary bodies and the intralaminar nuclei of the thalamus activates the pituitary- adrenocortical system. This can be checked directly by estimating the corticoid content of the blood in the adrenal li S 12 i6 20 Ih 2S iZ 36 W 'i'<Cm ^ 0 0 n: Cpdf- CpdaCpji fioH- ' ' nroaestet^one pro(jt Fig. Effect of stimulation ot ainygdale and pyritorni cortex on dogs. The figure shows appearance of 17-hydroxy-progesteronc following repeated stimulation (15 minutes daily for 5-6 days) of medial part of amygdale-pyriform cortex. Stimulation of lateral areas elicited only marked ele^'ation of resting corticoid secretion without the appearance of new secretory product or sexual hyperactivity. Step-like changes in the behaviour of animals were observed tiuring the stimulation of the above-mentioned structures as a consequence of rising intensity of stimuli. Marked orientation cliciteci by threshold stimuli was followed by emotional reactions (fear, avoiciing-reaction), and further elevation of stimulus mtensity induced extreme furious behaviour (O, 5-5, O V, 60-90 H, 3 msec). After cessation of stimulation the original behaviour returned without Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Council for International Organizations of Medical Sciences; Fessard, A. (Alfred); Delafresnaye, J. F. (Jean Francisque), 1919-. Springfield, Ill. , Thomas
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