?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Relative+hand+skill+predicts+academic+ability%3A+global+deficits+at+the+point+of+hemispheric+indecision&rft.creator=Crow%2C+T.+J.&rft.creator=Crow%2C+L.+R.&rft.creator=Done%2C+D.+J.&rft.creator=Leask%2C+S.&rft.subject=Behavioral+Neuroscience&rft.subject=Neuropsychology&rft.description=Population+variation+in+handedness+(a+correlate+of+cerebral+dominance+for+language)+is+in+part+genetic+and%2C+it+has+been+suggested%2C+its+persistence+represents+a+balanced+polymorphism+with+respect+to+cognitive+ability.+This+hypothesis+was+tested+in+a+sample+of+12%2C770+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%2C+non-verbal%2C+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+(%C2%93hemispheric+indecision%C2%94).+For+verbal+ability+females+performed+better+than+males%2C+but+the+relationship+to+relative+hand+skill+was+closely+similar+for+the+two+sexes%3B+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+%C2%93hemispheric+indecision%C2%94.+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.&rft.date=1998&rft.type=Journal+(Paginated)&rft.type=NonPeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F153%2F1%2Frelhand_tim.html&rft.identifier=++Crow%2C+T.+J.+and+Crow%2C+L.+R.+and+Done%2C+D.+J.+and+Leask%2C+S.++(1998)+Relative+hand+skill+predicts+academic+ability%3A+global+deficits+at+the+point+of+hemispheric+indecision.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F153%2F<script src='//archive-bar.soton.ac.uk/archive-bar.js'></script>