Midbrain distribution of neurons with strong, sustained responses to lordosis trigger stimuli in the female golden hamster.

Midbrain single units in anesthetized female hamsters were examined for pronounced, sustained responses to types of somatic stimuli which control the display of lordosis during periods of sexual receptivity. Units showing strong responses to lordosis trigger stimuli were widely distributed, but tended to be most concentrated in th deep superior colliculus, ventromedial midbrain and central gray, brain regions previously implicated, by other methods, in the control of hamster lordosis.