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KMID : 0351619660070020302
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Kyungpook Medical Journal
1966 Volume.7 No. 2 p.302 ~ p.309
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Effect of Vision on Single Leg Equilibration
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李相元/Lee,Sang Won
姜相遠/鄭奎和/姜賢植/Kang, Sang Won/Chung, Kyu Wha/Kang, Hyun Shik
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Abstract
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This study was undertaken to elucidate the possible effects of vision on the postural equilibration. The rolling movement of foot arch was recorded with tumbour, pressure transducer and strip chart recorder when the subjects standing on one leg, try to keep his body equilibration under various experimental conditions. The amplitude of the recorded rolling movement of foot was assumed to be a degree of difficulty of equilibration and compared the rosults in each condition with the normal condition, i. e., the normal head position and horizontal looking at the wall apart from the subject about 2 meters.
The results obtained are sumuerired as follows.
1. The maintenance of equilibration with single leg in such conditions as 1) normal head position and closed eyes, 2) looking at the ceiling right above the subject, 3) same head position as the second case but with eyes closed are more difficult than under normal condition, or is impossible without several times of temporal supportings and corrections within less than one minutes, particularly so in the last case ; but no particular difficulty of equilibration is noted when the subject looks down his foot region. This indicates that the vision plays an important role on the maintenance of body equilibration, and that the abnormal afferent impulses from the vestibular apparatus when the head is bent back ward may interfere the postural reflex actions while the bending of head downward may not.
2. When either the central or the peripheral visual field is occluded with normal head position, maintenance of equilibration is more difficult than under normal condition, but no significant difference is noted between the both conditions.
3. The maintenance of equilibration, when a white paper, on which many perpendicular lines were drawn, held in front of the subject´s face to gaze the lines, is moved slowly right and left repeatedly, is difficult as compared with the normal condition. This indicates that a false visual information has been feedbacked to interfere the postural reflex actions.
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