[Effect of dominant motivation on the functional organization of the auditory input into the sensorimotor cortex of the cat brain].

To consider the role of dominant motivation in functional organization of acoustic input to the sensorimotor cortex (SMC), a comparison was made of frequency reflection of tonal bursts in the rostral neocortex summary reactions, and for comparison, in the parietal association cortical area (PC), in the normal state, during pregnancy and after the kittens birth. During pregnancy an increase of the amplitude of averaged evoked potentials (AEP) of SMC and PC was observed practically in the whole studied frequency range. After kittens birth the range of changes narrowed and reactions with maximum amplitude were recorded in females to presentation of tonal bursts with frequencies which corresponded to spectral characteristics of their own kittens vocalizations. However, absolute value of changes of AEPs amplitude, observed in PC were less expressed. As a role the obtained data testify that reorganization of frequency selectivity of SMC acoustic input observed under the influence of dominant motivation, conforms to a change of kittens acoustic signals biological meaning for females in lactation period.