Lecture notes and notes from book (Fundamentals of Human Neuropsychology)

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Department
Psychology
Course
PSY318H5
Professor
Melissa Holmes
Semester
Winter

Description
Variationsin Cerebral Asymmetry Monday,March08, 2010 3:09PM Portrait:IndividualResponsestoInjury { A.B.vs.L.P. { A.B. Damagetotheposteriorpartof thelefttemporallobe Difficultiesinreading,speakingandrememberingwords { L.P. Similarinjury Troublerecognizingfaces,anddrawingpictures { Whatcouldaccount forthe differences? HandednessandFunctionalAsymmetry AnatomicalStudies { Handpreferencecorrelateswithdifferentialasymmetrypatterns { Left-handersshowmorevariationinasymmetry { Morefibersdescendtotherighthand { MRI { Littleevidenceofdifferencesinanatomyinrightandleft-handers { Greaterhemisphericinteractioninleft-handers FunctionalCerebralOrganizationinLeft-Handers { Majorityofleft-handershaveleftlateralizedspeech(70%) { Largerincidenceofleft-handednessamongchildrenwithneurologicaldisorders(dominant hemisphere) { Littleknownaboutcerebralorganizationofthosewithrighthemispherespeech TheoriesofHandPreference:EnvironmentalTheories { Behavioralutility { Proposeslefthandisbetterforholdingashieldorholdingababy { Causeandeffect { EnvironmentalReinforcement { Biasintheenvironment { Butleft-handersareonly~10% { EnvironmentalAccident { Geneticbiastowardsright-handedness { Left-handednessdevelopsthroughacerebraldeficit TheoriesofHandPreference:AnatomicalTheories { Right-handednessduetoenhancedmaturationandgreaterdevelopmentofthelefthemisphere { Mostspecieshavealeft-sideddevelopmentaladvantagebiasthatisnotgeneticallyencoded TheoriesofHandPreference:HormonalTheories { Differentlevelsoftestosteroneinfluencecerebralasymmetry(Geschwind-Galaburdatheory) { Highertestosterone=increasedlikelihoodofleft-handedness TheoriesofHandPreference:GeneticTheories { Annett { Dominantgeners+forspeechinthelefthemisphere,whichgivesmotoradvantagetoright hand { Recessivegeners-thatresultsinnosystematicbiasforspeechorhandedness { Modelpredictsabout12.5%left-handers SexDifferencesinCerebralOrganization { SexDifferencesinBehavior { MotorSkills Mensuperioratthrowingandinterceptingobjects Womensuperioratfinemotortasks www.notesolution.com
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