Abstract
The sexual behaviour of 16, oestradiol-treated, ovariectomized common marmosets was recorded before and after bilateral microinfusions of ibotenic acid (n = 8) or isotonic saline (n = 8) into the hypothalamus. Ibotenic acid-induced neuronal degeneration occurred in 5 females, mainly affecting the anterior and dorsomedial hypothalamus. Marked decreases in proceptivity (tongue-flicking, staring and immobile displays) occurred after ibotenic acid lesions, whereas sexual receptivity (refusals and terminations of male partners' mounts) was unchanged. In 3 females where microinfusions of ibotenic acid were attempted but failed to produce lesions, sexual behaviour was unaffected and resembled that measured in saline-treated controls. These results provide the first evidence that selective lesions of neuronal cell bodies in the anteromedial hypothalamus disrupt proceptivity whilst sparing sexual receptivity in a primate species.
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