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Evolution Genetics and Development
Questions about the Origins of Human Handedness
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actions analysis Annett associated asymmetries australopithecines bias biased bilateral birthday samples brain brainedness cerebral hemispheres cerebral specialisation cerebral speech Chapter chimpanzees classified comparison consistent cortex depend dextral dichotic listening dyslexia dyslexics dysphasia dysphasics evidence expected eye preference factor families females findings function genetic genotype hand preference handedness handedness groups Hecaen heterozygote hominids human hypothesis incidence of left-handedness included Kilshaw L-R differences L-R means L-R skill Ladinos language laterality left hemisphere left-handed relatives left-handed writers left-handers lesions males mixed mixed-handers motor movements nonpreferred hand normal distribution numbers observed pairs patients patterns peg-moving percentages planum temporale population Porac possible predicted preferred hand proportion of left-handers questionnaire reported right shift right-handers right-hemisphere speech right-sided rs+ gene s.s s.s scores Section sex differences sinistral situs inversus species split-brain statistically significant stimuli studies subjects suggested Table tasks theory threshold twins variability verbal visual writing