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group diversity member effect information performance group members participant negotiation psychology research motivation condition leader epistemic motivation emotion journal representative belief diversity beliefs personality epistemic oxytocin display process study interaction knippenberg conflict van kleef behavior van knippenberg kleef dimension prototypicality elaboration behaviour group norm manipulation information elaboration decision result happiness university faultline identity affective reactions management out-group team performance self-esteem hypothesis anger experiment reaction message affective difference situation level people press analysis overpayment perspective demand finding group processes non-cooperation outgroup erasmus univ rotterdam accountability structure task conflict outcome group membership point informationally vulnerability placebo