[The effect of an acoustic calling signal on the sex hormone level in the blood of white mice].

The action was studied of synthesized acoustic signals, similar to the natural invocatory ones by their characteristics, on the level of sexual hormones in male and female mature laboratory mice, and also the dependence of these hormonal shifts on rhythmic organization of the artificial sound signals. As a result of the experiments it was convincingly shown that synthesized acoustic signal with the frequency of 3500 Hz (S-1) caused a functional load on the glands of internal secretion which was testified by statistically significant increase in the level of sexual hormones in the blood of males (by testosterone and extradiole) and female mice (by extradiole and progesterone). In order to clear up the role of rhythmic organization of signal studies were conducted with the application of synthetic acoustic signal (S-2), different from S-1.

Impulse activity of medulla oblongata in rats in response to stimulation of taste receptors and visceral chemoreceptors.

We have recorded extracellularly the impulse activity of the rat medulla oblongata during stimulation of taste receptors of the tongue and visceral chemoreceptors with solutions of hydrochloric acid and sodium chloride. We have detected in the caudal region of the nucleus of the solitary tract, neurons that react to the chemical stimulation of either one or both the receptive zones mentioned. The response reactions of the isolated groups of units (taste, viscerochemical, and convergent neurons) are tonic and are characterized by a high level of impulse activity.

[Impulse activity of the rat medulla oblongata in response to stimulation of taste receptors and visceral chemoreceptors].

The unit activity from the medulla oblongata was extracellularly recorded during stimulation of taste receptors and visceral chemoreceptors of small intestine with the solutions of hydrochloric acid and sodium chloride. Neurons responding to the chemical stimulation are at the caudal part of nucleus tractus solitarius. Responses of taste, viscerochemical and convergence units are tonic and their discharge rates are low.