[Effect of positive and negative emotional states on the electrical activity of the auditory cortex in rabbit ontogeny].

It has been shown that in all age groups of animals, self-stimulation of the hypothalamus is accompanied with the decrease in the latent period and the increase in the amplitude of the evoked potential (EP) in the auditory cortex. During negative stimulation, the increase in temporal parameters of the response takes place together with the decrease in the amplitude of the EP and the onset of secondary waves. Significant age changes were revealed in the recovery of the initial pattern of the EP after cessation of stimulation of emotiogenic zones.

[Neuronal reactions of the auditory cortex to sounds of various frequencies in rabbits in ontogeny].

In 7-12-day rabbits, the auditory neurones respond to a narrow range of tonal signals of low frequency (500 Hz-4 KHz), but do not change at all, or only slightly change their parameters during the increase in stimulation frequency. The range of frequencies increases with age; the number of impulses in a discharge and the duration of the latent period are monotonously dependent on the frequency of a signal. At the end of the 4th week, the auditory neurones respond by non-monotonous patterns of impulsation and latent period to changes in tonal characteristic of the signal.