title: [Perception of 2-dimensional space coordinates during prolonged experimental hypokinesia].
abstract: The effect of a 30-day hypokinesia on the perception of the subjective optic vertical (SOV) was studied. The test subjects who were in the antiorthostatic position (at an angle of 96 degrees to the vertical) showed the greatest changes in the SOV perception and illusive perception of the spatial position of the body. During the first two days of the experiment and ten days after it they displayed a 1.5-fold increase in the error of the SOV perception. In addition, they exhibited an asymmetrical perception of the SOV on the right and left side. In all cases the direction of the SOV displacement from the true line coincided with the body position. The test subjects who were kept at an angle of 84 degrees to the vertical (orthostatic hypokinesia) demonstrated only illusions of the body position during the first hypokinetic day and a unilateral increase in the error of the SOV perception after the experiment. The test subjects who underwent preventive treatment following antiorthostatic hypokinesia (at an angle of 94 degrees to the vertical) exhibited no asymmetry and an insignificant error in the SOV perception. These findings are discussed with regards to the changes in the function of pressuretension receptors and disorders in the skeletal tone during hypokinesia.
mesh_terms: D000328:Adult; D001274:Atmospheric Pressure; D004558:Electric Stimulation; D006801:Humans; D007103:Immobilization; D007866:Leg; D008297:Male; D009132:Muscles; D011187:Posture; D013028:Space Perception; D013997:Time Factors
vernacular_title: Vospriiatie koordinat dvukhmernogo prostranstva pri dlitel'noĭ éksperimental'noĭ gipokinezii