[Sex dimorphism of the interhemispheric asymmetry in the control of pain vocalizations in rats].

First impulses were studied of pain vocalizations, elicited by electrostimulation of the tail root of semirigidly fixed 105 male and 95 female white rats of Wistar line. The rats were divided into three groups: with intact brain, with inactivated cortex of the left hemisphere and with inactivated cortex of the right one. It is shown, that as a result of unilateral decortication both in males and females changes take place in the character of durations distribution and probability of manifestation, as well as a reduction of the latency and an increase of peak amplitude of the recorded impulses. It is important that both in male and female rats the consequences of the left and right hemispheres inactivation differ by the influence on the character of durations distribution, probability of manifestation and the latency of pain vocalizations. At the same time, in males functional interhemispheric asymmetry of the control of probability of pain cries manifestation and latencies of pain squeals is more expressed than in females.