[Reactions of the neurons of midbrain and diencephalic structures during perception of acoustic signals and induced vocalization].

75% of the chick mesencephalic and diencephalic neurons changed their activity both on perception of acoustic stimuli (noise, frequencu-modulated tone, ecological stimuli) and at the emission of sound. The data obtained suggest that structures of the chick mesencephalon and diencephalon are involved in vocal reactions and have sound-sensitive neurons processing the acoustic information. The diencephalic neurons were found to have a higher specificity as compared with the mesencephalic cells.