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The role of interhemispheric asymmetry in sensorimotor measurements оf perceptual illusions 1159
Karpinskaya V.Yu.
Cand. Sci. in Psychology, Senior Lecturer of the Department of Psychology,
St. Petersburg State University Lyahovetsky V.A.
Pavlov Institute of Physiology, RAS, Laboratory of Physiology of Movements
The role of interhemispheric asymmetry in the conscious control of sensorimotor measurements оf Muller-Lyer illusion was investigated. We used the illusion of perception as a phenomenon of consciousness to find out how an error value depends on the left and right hemisphere contribution to control in decision-making. We compared the precision of the left and right hand’s movements on touchscreens during the measurement of the segments lengths. It was found that the left and right hand controlled by two hemispheres by different ways had made different errors during these measurements. The constant bias of the right hand’s movements is larger than for the left one. The conclusion is that the hemisphere mostly involved in movement control determines the dominant system of representation (metric and categorical) and the control’s type in decision-making (automatic or conscious). The increase or decrease of the accuracy of the illusory object measurement depends on the increase or decrease of the conscious control.
Keywords: illusions of perception, interhemispheric asymmetry, conscious control, visual-motor coordination
Column: Psychology of Perception
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