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1、BEHAVIOURAI.BRAINRESEARCHELSEVIERBehaviouralBrainResearch64(1994)141-149InterhemisphericintegrationofsimplevisuomotorresponsesinpatientswithpartialcallosaldefectsG.Tassinaria'*,S.Agliotia,R.Pallinib,G.Berlucchia,G.F.Rossib='lstitutodiFisiologiaUmana,Universita"diVerona,St
2、radaLeGrazie,1-37134Verona,ItalyhlstitutodiNeurochirurgia,Universita"CattolicadelS.Cuore,Roma,ItalyReceivedlFebruary1993;revised9September1993;accepted9September1993AbstractBecauseoftheorganizationofvisualandmotorpathways,simplemanualresponsestoalightstimulusintherightorl
3、eftvisualhemifieldsareperformedfasterwithuncrossedhand-fieldcombinationsthanwithcrossedhand-fieldcombinations.Uncrossedresponsescanbeintegratedwithinasinglehemisphere,whereascrossedresponsesrequireatime-consuminginterhemispherictransferviathecorpuscallosumwhichisreflected
4、inthedifferencebetweencrossedanduncrossedreactiontimes.Weinvestigatedcrossed-uncrosseddifferences(CUDs)inspeedofsimplevisuomotorresponsestolateralizedflashesinsevensubjectswithananteriorsectionofthecorpuscallosumsparingthespleniumandinonesubjectwithanageneticabsenceofthes
5、pleniumduetoacerebrovascularmalformation.TherewasnoevidenceofanabnormalprolongationoftheCUDsinanyofthesesubjects,insharpcontrastwiththeverylongCUDsexhibitedbyanepilepticsubjectwithacompletecallosalsectionandtwosubjectswithtotalcallosalagenesistestedinthesameexperimentalsi
6、tuation[1].ThenormalityoftheCUDsinthesubjectswithpartialcallosaldefectswasnotduetoapostoperatoryreorganizationofinterhemisphericcommunication,sincetherewasnoindicationofanincreasedCUDinapatienttestedasearlyas5daysaftertheanteriorcallosotomy.Theseresultsarecompatiblewithth
7、eassumptionthatbothanteriorandposteriorcallosalroutesmaysubservetheintegrationofspeededmanualresponsestoavisualstimulusdirectedtothehemisphereipsilateraltotherespondinghand.Keywords:Visuomotorintegration;Interhemisphericcommunication;Callosotomyinman;Callosalagenesis;Reac
8、tiontime1.Introductionhemisphere.Thus,whileuncrossedreactionscanbedi-rectlymediatedwithinthesame
