Y. Koyama, I. Fujita, H. Nishino and Y. Oomura
Natl. Inst. Physiol. Sci., Okazaki 444, Japan.
Although much were discussed about the role of the hypothalamus in the sexual behavior of female vertebrates, there is no report of female monkey's sexual behavior elicited by electrical brain stimulation. In this study, we examined the effects of electrical stimulation of the hypothalamus on female monkey behavior. Immediately after the stimuli (duration: 0.5 ms; frequency: SO Hz; pulse number: 125; 15-140 uA), delivered to several sites in the hypothalamus, the female, sitting with her back towards the male, turned her face to the male and gazed on him. This orienting behavior facilitated male's "touching" to the female. The phenomenon cannot be a simple motor effect because 1) it was directed to the male even when the position of the male was changed, and 2) was not evoked when the male was absent. Our results suggest that this orienting behavior can be regarded as soliciting behavior and also that the hypothalamus has important roles in eliciting same components of the sexual behavior of female monkey. (Supported by a grant from Itoh Science Foundation)
Keywords: Sexual behavior, Female monkey