HEMISPHERIC INTERACTION IN UNIMANUAL AND BIMANUAL TARGET LOCALIZATION (CEREBRAL LATERALIZATION, MOTOR LATERALITY).
Item
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Title
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HEMISPHERIC INTERACTION IN UNIMANUAL AND BIMANUAL TARGET LOCALIZATION (CEREBRAL LATERALIZATION, MOTOR LATERALITY).
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Identifier
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AAI8423086
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identifier
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8423086
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Creator
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LUHR, JUDITH CHALLOP.
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Contributor
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Mitchell L. Kietzman
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Date
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1984
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Language
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English
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Publisher
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City University of New York.
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Subject
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Psychology, Physiological
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Abstract
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Fifty normal men and women were asked to manually locate a target or targets they had seen prior to being blindfolded. Their accuracy in localizing a target without visual guidance was measured for three movement conditions: Unimanual (U), where each hand moved to a target separately; Simultaneous Symmetrical (SS), where both hands aimed simultaneously for targets at corresponding locations, and Simultaneous Asymmetrical (SA), where both hands aimed simultaneously for targets at different locations. The asymmetrical condition task had been designed to represent a motor analogue of sensory tasks such as dichotic listening and dichhaptic stimulation in order to produce greater functional differences between the right and left hands in the SA condition as compared to the U condition.;Contrary to predictions, there was a trend for the right hand to be more accurate than the left hand in the U condition, but there were no differences between the hands in either the SS or SA conditions. What was revealed by the study was the extremely strong tendency toward symmetry in bilateral motor performance, even among strongly right-handed, normal subjects. In addition the study revealed that a significant increase in error from unimanual performance occurred during bimanual simultaneous asymmetrical movement but not during bimanual simultaneous symmetrical activity. Another interesting, but unexpected finding was that the right-handed women were much more accurate than the right-handed men in every movement condition.;The study raises some issues about the tendency towards symmetry of movement in normal adults and phylogenetic and ontogenetic significance of hemispheric symmetry and asymmetry. Additionally, the implications of hemispheric asymmetry research for developmental disorders, adult brain damage, and psychiatric disorders are discussed.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Psychology
