Brain Hemispheric Damage and Constructional Disorders-From the Standpoint of Hemispheric Lateralization-

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  • 大脳半球損傷と構成障害について―半球側性という観点から―
  • —From the Standpoint of Hemispheric Lateralization—
  • ―半球側性という観点から―

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We evaluated the validity of the conventional theory proposing that constructional function is localized separately in the right and left hemispheres of each individual. In patients with brain damage, constructional ability was evaluated using control factors such as criteria, etiology, and the location and extension of the lesion. The subjects consisted of 33 patients with cerebral infarction (23 with left brain damage and 10 with right brain damage) . The subjects copied Rey's complex figure, and their drawings were assessed using the Rey-Osterrieth unit scoring system. The following results were obtained. 1) Comparison between the groups with right or left brain damage showed good constructional ability in the group with left brain damage but decreased ability in the group with right brain damage. 2) For both groups, patients with an exceptional score were suspected to have anomalous lateralization. These results suggested that: (1) constructional function is not localized separately in each hemisphere in each individual, but is generally localized contralateral to the localization of language function (mostly the right hemisphere) ; and (2) language and constructional functions are localized in the same hemisphere only in exceptional cases.

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