The Minor Cerebral Hemisphere

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Abstract
Three right-handed men became aphasic following acute left cerebral hemisphere ischemia, Prior to arteriography, intracarotid amobarbital injections were given bilaterally in two cases on separate occasions, and on the left in the third. With none of the three left-sided injections was there the customary speech arrest. Aphasic speech continued without major alteration. With both of the right-sided injections complete arrest of speech and, indeed, of all vocalization resulted. On all occasions it could be shown by his motor response to verbal instruction that the subject remained fully conscious. We infer that the aphasic speech was programmed by the right hemisphere (previously minor).