• To contribute to the Geschwind-Galaburda theory of cerebral lateralization, we examined the relationship of left-handedness to allergic disorders and stuttering, using epidemiological data of two French samples, one of which (N = 9591) is representative of the French male population between 17 and 24 years of age. Results showed a higher frequency of stuttering but not of allergic disorders in left-handers. Extreme right-handedness was observed to be significantly associated with a lower frequency of allergic disorders; response bias might explain such a relationship. Findings were confirmed after allowing for potential confounding factors, such as age and education. In both samples, stuttering and allergic disorders were significantly related.
Dellatolas G, Annesi I, Jallon P, Chavance M, Lellouch J. An Epidemiological Reconsideration of the Geschwind-Galaburda Theory of Cerebral Lateralization. Arch Neurol. 1990;47(7):778–782. doi:10.1001/archneur.1990.00530070074013
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