Fujita, I., Koyama, Y., Nishino, H. and Oomura, Y. (1986)
Natl. Inst. Physicl. Sci., Okazaki 444,
* Dept. Physiol., Fac. Med., Fukuoka 812
The effects of electrical stimulation of the sexual behaviors were examined in male rhesus monkeys (Macaca mulatta). Cathodal rectangular pulses (duration: 0.5 ms; frequency: 50Hz; pulse number: 125) were systematically applied to various sites in the preoptic area (POA) and the hypothalamus of partially-restrained animals, and the effects on the behavior were analysed with a video camera. Electrical stimuli of 15-100 μA to the medial POA, dorsomedial and lateral hypothalamic areas (DMH and LH) elicited 'touching' to female's back and rump. Stronger stimuli of 150-500 μA to DMH, LH and ventromedial hypothalamus (VMH) elicited 'mounting' following the 'touching'. 'Grooming' were elicited by electrical stimuli of 15-300 μA to some loci in the LH and. lateral POA. 'Mounting' and 'grooming' occurred reproducibly after the stimulus. The results suggest that specific parts of the hypothalamus are involved in the regulation of 'mounting' and 'grooming' of the male monkey.