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Relative hand skill predicts academic ability: global deficits at the point of hemispheric indecision

Crow, T. J. and Crow, L. R. and Done, D. J. and Leask, S. (1998) Relative hand skill predicts academic ability: global deficits at the point of hemispheric indecision. [Journal (Paginated)]

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Abstract

Population variation in handedness (a correlate of cerebral dominance for language) is in part genetic and, it has been suggested, its persistence represents a balanced polymorphism with respect to cognitive ability. This hypothesis was tested in a sample of 12,770 individuals in a UK national cohort (the National Child Development Study) by assessing relative hand skill (in a square checking task) as a predictor of verbal, non-verbal, and mathematical ability and reading comprehension at the age of 11 years. Whereas some modest decrements were present in extreme right handers the most substantial deficits in ability were seen close to the point of equal hand skill (“hemispheric indecision”). For verbal ability females performed better than males, but the relationship to relative hand skill was closely similar for the two sexes; for reading comprehension males close to the point of equal hand skill showed greater impairments than females. Analysed by writing hand the relationship of ability to hand skill appeared symmetrical about the point of “hemispheric indecision”. The variation associated with degrees of dominance may reflect the operation of continuing selection on the gene (postulated to be X-Y linked) by which language evolved and speciation occurred.

Item Type:Journal (Paginated)
Keywords:schizophrenia, psychosis, hemispheric specialisation, hand skill, hemisphere, lateralisation, dominance, verbal ability, reading, dyslexia, sex difference, X chromosome, Y chromosome, handedness, academic ability.
Subjects:Neuroscience > Behavioral Neuroscience
Neuroscience > Neuropsychology
ID Code:153
Deposited By:Crow, Tim
Deposited On:11 Jul 2000
Last Modified:11 Mar 2011 08:53

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