简介：Acriticaldifferencebetweentherighthemispherehypothesisandvalencehypothesisofemotionprocessingiswhethertheprocessingofhappyfacialexpressionsislateralizedtotherightorlefthemisphere.InthisstudyparticipantsfromaChinesesamplewereaskedtoclassifyhappyorneutralfacialexpressionspresentedeitherbilaterallyinbothvisualfieldsorunilaterallyintheleftvisualfield(LVF)orrightvisualfield(RVF).Theywererequiredtomakethespeededresponsesusingeithertheleftorrighthand.Itwasfoundthatforbothleftandrighthandresponses,happy(andneutral)expressionspresentedintheLVFwereidentifiedfasterthanhappy(andneutral)expressionspresentedintheRVF.BilateralpresentationshowednofurtheradvantageoverLVFpresentation.Moreover,lefthandresponsesweregenerallyfasterthanrighthandresponses,althoughthiseffectwasmorepronouncedforneutralexpression.Thesefindingswereinterpretedassupportingtherighthemispherehypothesis,withhappyexpressionbeingidentifiedinitiallybytherighthemisphere.