Criteria for Evaluating the Claim of Greater RH Involvement Based on Crossed Aphasia Evidence

In order to have confidence in the accuracy of the estimates of crossed aphasia in bilinguals, one would want the study to meet the following criteria: (i) The sample should consist of a large number of randomly obtained, unselected cases of monolinguals and bilin-guals; (ii) testing should be undertaken at a single location, using a comprehensive testing instrument, with the severity and type of deficit noted along with the occurrence of any language-related deficit; and (iii) cases of left- and right-sided lesions in both aphasic and nonaphasic persons should be included. Comparing bilinguals and monolinguals already diagnosed as aphasic does not provide a true test of the actual incidence of aphasia subsequent to right-sided injury in each group.

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