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Evolution Genetics and Development
Questions about the Origins of Human Handedness
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ability actions advantage analysis Annett areas asked associated asymmetries bias biased brain cerebral Chapter classes classified combined comparison considered consistent depend differences direction distribution dominant dyslexics early effects estimate evidence examined expected expression factor families females Figure findings function further gene genetic genotype given gives greater groups hand preference handedness hemisphere human hypothesis incidence of left-handedness included individual language laterality left hemisphere left-handers lesions less majority males mean measures mixed mothers motor movements normal Note numbers observed pairs parents patients patterns peg-moving percentages performance population possible predicted present probably problems proportion question questionnaire reading relatives reported responses right-handers right-hemisphere samples scores seems sex differences shift shown side significant sinistral skill species speech studies subjects suggested Table tasks theory threshold trend twins types variability verbal visual writing