Effect of amygdaloid lesions on oestrous behaviour in the deermouse.

Lesions were placed bilaterally in the medial and basolateral amygdaloid nuclei of adult female deermice (P. m. bairdii) by means of a Radio Frequency Lesion Maker with a current of 20 \g=m\A/30 sec. It was found that females with lesions in the basolateral amygdaloid nucleus exhibited normal cyclic vaginal smears and mating activities. However, 30% of the females exhibited hypersexuality as evaluated by excessive mating and reception of the male during dioestrus. Females with lesions in the medial amygdaloid nucleus exhibited normal