SOME RESPIRATORY, VASCULAR AND THERMAL RESPONSES TO STIMULATION OF ORBITAL SURFACE OF FRONTAL LOBE

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Abstract
Monkeys and dogs were studied for respiratory and blood pressure responses to electrical stimulation of the orbital surface and certain regions of hidden cortex in the frontal lobes. Responses depend very critically upon the exact parameters of stimulation, and changes in frequency or intensity are followed by distinct alterations in character of the response or obliteration of the response. Stimulation of the orbital surface lateral to the olfactory tract in the region of the posterior orbital gyrus is followed by immediate complete respiratory position. Blood pressure usually undergoes a delayed slow rise, although there is an occasional immediate sharp fall, elicited by stimulation. Mechanical, thermal, and electrical stimuli are followed by prompt rise in temp. of the extremities (6-7[degree] F.) and ablation of this area in chronic expts. produces an animal with warmer extremities which show augmented reflex vasodilatation. Stimulation of cortex hidden within the depths of the sulcus principalis in monkey or praesylvius in dog demonstrates regions of even greater responsiveness for respiratory effects. Depending upon the exact characteristics of stimulation, autonomic or somatic motor responses can be obtained from the same point.