•The influence of language rehabilitation on specific language skills (speaking, understanding, writing, and reading) was investigated in 281 aphasic patients (162 reeducated and 119 controls) who were subjected to a second examination no less than six months after the first. The relationship of the following factors to improvement was studied: (a) time between onset of aphasia and first examination; (b) type of aphasia; (c) overall severity of aphasia on first examination; (d) presence or absence of rehabilitation between first and subsequent examination. It was found that rehabilitation had a significant positive effect on improvement in all language skills. Time between onset and first examination and overall severity of aphasia were negatively related to improvement. The relationship of type of aphasia to improvement was not significant. Additional evidence of the efficacy of rehabilitation is provided by experience with patients who began language therapy several months or years after the onset of their language disorder.

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We report two female patients who became global aphasic following a large left hemisphere lesion. With passage of time they recovered to a considerable extent, but three years and six months, respectively, after the former CVA, a new stroke lateralized to the right hemisphere occurred and they showed a definite worsening of language disturbances. Possibilities and limits of the right hemisphere in "taking over" language functions are discussed.