Volume 32 #4

Contents

1. Threshold duration of sound signals for their sources approaching and withdrawing under condition of high-frequency hearing loss modeling
2. The nature of changes in impulse activity of neurons of hypothalamic supraoptic nucleus following prolonged exposure to vibration
3. Visual acuity of ophthalmologically healthy people and features of form the foveal pit of the retina
4. Characteristics of morphological development of the extreme retinal periphery near ora serrata
5. The effect of local diascleral stimulation of the extreme and middle peripheral parts of the retina on foveal contrast sensitivity and color recognition
6. Neural encoding mechanism of the symmetrical crosses in the visual system
7. Mapping of enclosed buildings using mobile radio tomography
8. Projectively invariant description of non-planar smooth figures. 2. On recognition of ovaloids of revolution

In the norm and in the dynamics of a single (two-hour) and prolonged (daily for 2 hours within 5, 10, 15 and 30 days) vibration effects changes in the impulse background activity of the supraoptic nucleus of the hypothalamus were studied. Experiments were conducted in albino male rats anesthetized with Nembutal (40 mg/kg, intraperitoneally) under the conditions of acute experiment by extracellular recording. Recording and analysis of impulse activity of neurons in the hypothalamic SON were carried out by a specially developed computer program for biological signals. The rats were exposed to a common vertical vibration of 60Hz frequency, 0.4 mm amplitude, for two hours daily, in a no sound dampening chamber, on a vibration table of EV-1 brand. It is shown that changes in the background activity of SON cells in the dynamics of prolonged exposure to common vertical vibrations have phase characteristics.

Key words: background impulse activity, vibration action, supraoptic nucleus of the hypothalamus

DOI: 10.1134/S0235009218040066

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