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1、20130130TheExpressionofEmotionsJoyandsadnessareexperiencedbypeopleinallculturesaroundtheworld,buthowcanwetellwhenotherpeoplearehappyordespondent?Itturnsoutthattheexpressionofmanyemotionsmaybeuniversal.Smilingisapparentlyauniversalsignoffriendlinessandapproval.Baringtheteethinahostileway,as
2、notedbyCharlesDarwininthenineteenthcentury,maybeauniversalsignofanger.Astheoriginatorofthetheoryofevolution,Darwinbelievedthattheuniversalrecognitionoffacialexpressionswouldhavesurvivalvalue.Forexample,facialexpressionscouldsignaltheapproachofenemies(orfriends)intheabsenceoflanguage.Mostin
3、vestigatorsconcurthatcertainfacialexpressionssuggestthesameemotionsinallpeople.Moreover,peopleindiverseculturesrecognizetheemotionsmanifestedbythefacialexpressions.InclassicresearchPaulEkmantookphotographsofpeopleexhibitingtheemotionsofanger,disgust,fear,happiness,andsadness.Hethenaskedpeo
4、plearoundtheworldtoindicatewhatemotionswerebeingdepictedinthem.ThosequeriedrangedfromEuropeancollegestudentstomembersoftheFore,atribethatdwellsintheNewGuineahighlands.Allgroups,includingtheFore,whohadalmostnocontactwithWesternculture,agreedontheportrayedemotions.TheForealsodisplayedfamilia
5、rfacialexpressionswhenaskedhowtheywouldrespondiftheywerethecharactersinstoriesthatcalledforbasicemotionalresponses.Ekmanandhiscolleaguesmorerecentlyobtainedsimilarresultsinastudyoftenculturesinwhichparticipantswerepermittedtoreportthatmultipleemotionswereshownbyfacialexpressions.Thepartici
6、pantsgenerallyagreedonwhichtwoemotionswerebeingshownandwhichemotionwasmoreintense.Psychologicalresearchersgenerallyrecognizethatfacialexpressionsreflectemotionalstates.Infact,variousemotionalstatesgiverisetocertainpatternsofelectricalactivityinthefacialmusclesandinthebrain.Thefacial-feedba
7、ckhypothesisargues,however,thatthecausalrelationshipbetweenemotionsandfacialexpressionscanalsoworkintheoppositedirection.Accordingtothishypothesis,signalsfromthefacialmuscles("feedback")aresentbacktoemotioncentersofthebrain,andsoaperson'sfacialexpressioncaninf
