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1、2005Text1Everybodylovesafatpayrise.Yetpleasureatyourowncanvanishifyoulearnthatacolleaguehasbeengivenabiggerone.Indeed,ifhehasareputationforslacking,youmightevenbeoutraged.Suchbehaviourisregardedas“alltoohuman”,withtheunderlyingassumptionthatotheranimalswouldnotbecapableofthisf
2、inelydevelopedsenseofgrievance.ButastudybySarahBrosnanandFransdeWaalofEmoryUniversityinAtlanta,Georgia,whichhasjustbeenpublishedinNature,suggeststhatitalltoomonkey,aswell.Theresearchersstudiedthebehaviouroffemalebrowncapuchinmonkeys.Theylookcute.Theyaregood-natured,co-operativ
3、ecreatures,andtheysharetheirfoodtardily.Aboveall,liketheirfemalehumancounterparts,theytendtopaymuchcloserattentiontothevalueof“goodsandservices”thanmales.SuchcharacteristicsmakethemperfectcandidatesforDr.Brosnan'sandDr.dewaal's;study.Theresearchersspenttwoyearsteachingtheirmon
4、keystoexchangetokensforfood.Normally,themonkeyswerehappyenoughtoexchangepiecesofrockforslicesofcucumber.However,whentwomonkeyswereplacedinseparatebutadjoiningchambers,sothateachcouldobservewhattheotherwasgettinginreturnforitsrock,theirbehaviourbecamemarkedlydifferent.Intheworl
5、dofcapuchinsgrapesareluxurygoods(andmuchpreferabletocucumbers)Sowhenonemonkeywashandedagrapeinexchangeforhertoken,thesecondwasreluctanttohandhersoverforamerepieceofcucumber.Andifonereceivedagrapewithouthavingtoprovidehertokeninexchangeatall,theothereithertossedherowntokenatthe
6、researcheroroutofthechamber,orrefusedtoacceptthesliceofcucumber.Indeed,themerepresenceofagrapeintheotherchamber(withoutanactualmonkeytoeatit)wasenoughtoinduceresentmentinafemalecapuchin.Theresearchessuggestthatcapuchinmonkeys,likehumans,areguidedbysocialemotions,inthewild,they
7、areaco-operative,grouplivingspecies,Suchco-operationislikelytobestableonlywheneachanimalfeelsitisnotbeingcheated.Feelingsofrighteousindignation,itseems,arenotthepreserveofpeoplealone,Refusingalesserrewardcompletelymakesthesefeelingsabundantlycleartoothermembersofthegroup.Howev
8、er,whethersuchasenseoffairnessevolvedindependentlyincapuchins
