Penile Erection Evoked From Forebrain Structures in Macaca mulatta

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Abstract
ELECTRICALLY evoked penile erection has been systematically studied in the squirrel monkey1-5 but comparable data have not been reported for other primates. This report describes the phenomenon in Macaca mulatta and presents quantitative measures of the density and distribution of points eliciting the response from the forebrain of this species. In addition, an attempt was made to relate penile erection to other effects evoked from the same points, including autonomic changes and behaviors indicative of the reinforcement value of the stimulation. Methods The methods used in this study have been peviously described.6 Briefly, data were gathered from 5,880 loci distributed along 205 electrode tracks in 15, 8 to 10 lb male M mulatta. Roving monopolar electrodes were used in conjunction with a head-mounted stereotactic electrode guidance platform made of acrylic cement.7 This platform allowed the insertion of individual electrodes in unanesthetized animals, exploration of a column

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