Igor S Chetyrbok

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Sleep and wakefulness on the land were studied electrophysiologically in one adult female Cape fur seal (Arctocephalus pusillus). In two 24-h sessions, slow-wave sleep and paradoxical sleep averaged 27.4% and 4.6% of the total recording time. Almost 40% of the total slow-wave sleep time was accounted for episodes with well-defined interhemispheric ECoG(More)
We recorded an electroencephalogram from the two hemispheres, a neck musculature electromyogram, an electrooculogram, and respiratory acts during sleep and wakefulness on land in three 1-year-old sea lion females for 3 or 4 consecutive days. On average active wakefulness (AW) occupied 20.4+/-2.0% of the 24-h period; quiet wakefulness (QW) 54.9+/-2.5%; slow(More)
For the first time, sleep was studied in a representative of the order of Sirenia. Slow wave sleep occupied 27%, and paradoxical sleep 1% of the total recording time in the Amazonian manatee,Trichechus inunguis. The circadian rhythmicity of sleep was pronounced. During the sleep period, the manatee woke up for a short time for each respiratory act.(More)
Research was performed on the intracellular activity of 150 neurons belonging to area 17 of the binocular region of the chipmunk visual cortex, showing that 65% were directionally selective and tuned (to varying degrees) to the angle of boundaries between contrasting areas and a light bar; 18% were not tuned to the direction and angle of stimulus movement,(More)
39 orientation-selective neurons and 25 neurons responding to total illumination of the receptive field were investigated by exposing to achromatic and chromatic stimuli. Switching on and off of the bar stationary stimuli has revealed that orientation-selective neurons were not chromatically opponent. But when they were tested by moving chromatic bars,(More)
The extracellular activity of 150 neurons (field 17) from binocular region of the visual cortex in the Siberian chipmunk was investigated. 65% of neurons proved to be selective to orientation and selective (but differently) to the direction of movements of the contrast boundaries and light. 18% of neurons were nonselective to the orientation and direction(More)
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