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Handedness, language dominance and aphasia: a genetic model.

McManus, IC; (1985) Handedness, language dominance and aphasia: a genetic model. Psychol Med Monogr Suppl , 8 pp. 1-40.

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Abstract

A simple two-allele Mendelian model of the genetics of handedness is described and fitted to data in the literature. The model proposes that there are two alleles, D (dextral) and C (chance), the homozygous DD genotype producing only right-handers (directional asymmetry), the homozygous CC genotype producing a racemic mixture of 50% right-handers and 50% left-handers (fluctuating asymmetry), and the heterozygote, DC, being intermediate between the homozygotes and producing 25% left-handers, and 75% right-handers. It is also suggested that the true population incidence of left-handedness is 7.75%, deviations from this figure being due to either criterion shifts or selection biases. The same model is then fitted, by means of a number of minor conceptual extensions, to data from the literature on the relationship of handedness to language dominance, acute and permanent aphasia, and visual processing dominance.

Type: Article
Title: Handedness, language dominance and aphasia: a genetic model.
Location: England
Keywords: Aphasia, Brain Damage, Chronic, Cerebral Cortex, Dichotic Listening Tests, Female, Functional Laterality, Hand, Humans, Language, Male, Models, Genetic, Phenotype, Speech, Twins, Visual Perception
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > UCL Medical School
URI: http://discovery.ucl.ac.uk/id/eprint/10032953
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