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Dissociable contributions of the two cerebral hemispheres to judgments of line orientation

Published online by Cambridge University Press:  26 February 2009

Ziyah Mehta  and
Freda Newcombe
Ziyah Mehta
Affiliation:
Russell-Cairns Unit, Department of Neurosurgery, The Radeliffe Infirmary, Oxford OX2 6HE, UK
Freda Newcombe
Affiliation:
Russell-Cairns Unit, Department of Neurosurgery, The Radeliffe Infirmary, Oxford OX2 6HE, UK
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Abstract

A previous study of the performance of men with chronic unilateral focal brain lesions (due to wartime missile injury) on a standard test of line orientation suggested a left hemisphere (LH) as well as a right hemisphere (RH) contribution to visuospatial processing. The present study was designed to fractionate the variables that could underlie this unexpected finding and thereby to tease out the mechanisms involved in LH as compared with RH processing. A simpler (“purer”) version of the standard line orientation task was used, as were two other versions in which matching in an array and matching with distractors were measured. The findings confirmed the hypothesis of RH involvement in the purer task of metric measurement and suggested that the LH has an important role in keeping track of decisions and updating decisions in more complex aspects of line orientation judgment. (JINS, 1996, 2, 335–339.)

Keywords

Hemispheric differencesLine orientation judgment
Type
Research Article
Information
Journal of the International Neuropsychological Society , Volume 2 , Issue 4 , July 1996 , pp. 335 - 339
Copyright
Copyright © The International Neuropsychological Society 1996

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