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Scientific Commentaries |
The right place at the right time?
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Language functions that are disrupted by focal lesions in the left hemisphere often recover substantially over time. It has long been hypothesized that the right hemisphere gradually assumes language functions that have been impaired by left hemisphere lesions. This hypothesis has received support from a variety of sources. Individuals who recover from aphasia after stroke often become aphasic again after right hemisphere lesions (Nielson, 1946
; Levine and Mohr, 1979) or after sodium amytal injection in the right carotid artery (Kinsbourne, 1971), consistent with the hypothesis that language had ‘crossed’ to the right hemisphere. Likewise, functional neuroimaging studies have often revealed more activation in the right hemisphere during language tasks in recovered aphasic patients compared to healthy controls (Weiller et al., 1995; Ohyama et al., 1996; Cappa et al., 1997; Musso et al., 1999
Department of Cognitive Science, Johns Hopkins University School of Medicine Baltimore, MD, USA E-mail: argye@jhmi.edu
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