Crossed Aphasia and Related Anomalies of Cerebral Organization: Case Reports and a Genetic Hypothesis

Anomalous lateralization of cognitive functions is observed in a small percentage of right-handed patients with unilateral brain damage, either crossed aphasia (aphasia after right brain damage) or “crossed nonaphasia” (left brain damage without aphasia but with visuospatial and other deficits typic...

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Bibliographic Details
Published in:Brain and language 1996-11, Vol.55 (2), p.213-239
Main Authors: Alexander, Michael P., Annett, Marian
Format: Article
Language:English
Subjects:
Adult
Adult and adolescent clinical studies
Aged
Aphasia - physiopathology
Biological and medical sciences
Brain - physiopathology
Cognition Disorders - diagnosis
Dominance, Cerebral
Female
Functional Laterality
Humans
Language and communication disorders
Male
Medical sciences
Middle Aged
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
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Description
Summary:Anomalous lateralization of cognitive functions is observed in a small percentage of right-handed patients with unilateral brain damage, either crossed aphasia (aphasia after right brain damage) or “crossed nonaphasia” (left brain damage without aphasia but with visuospatial and other deficits typical of right brain damage). No comprehensive theory of these anomalous cases has been proposed. Nine new right-handed cases (plus one left-handed case) were analyzed and the literature was reviewed. The dramatically anomalous organization of cognitive functions is best explained by random lateralization of all cognitive functions in a small subset of the population. The RS theory of cerebral dominance can account for this pattern of anomalies in right-handers and may account for the most common patterns of dominance observed in left-handers.
ISSN:0093-934X
1090-2155
DOI:10.1006/brln.1996.0102