Abstract
Abstract Penile erection and seminal ejaculation were evoked by electrical stimulation of the preoptic area in an adolescent M. mulatta . The ejaculate contained innumerable motile spermatozoa. Elicitation of ejaculation required repetitive application of brief pulse trains and was sensitive to changes in pulse repetition rate. The response resembled the normal in being preceded and accompanied by penile erection, was often accompanied by pelvic thrusting, and the discharge of semen was invariably projectile. The response was accompanied by an increase in cardiac and respiratory rates and was followed by a period of relative refractoriness for penile erection. Measures of motivational correlates yielded paradoxical results. Self-stimulation occurred, if at all, only at very low overall rates, while escape-from-stimulation was consistently performed with short latencies.
Published Version
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