= Samuel L. Gaertner
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<Samuel L. Gaertner> studied <intergroup bias> and the <common ingroup identity model>. Comparing representations of one group, two groups or separate individuals tests how group boundaries influence evaluation. The manipulation concerns how people categorize a situation, rather than assuming that changing a group label removes every source of <prejudice>. <Reducing intergroup bias: the benefits of recategorization by Samuel L. Gaertner and others>[1989, experimental group representations and recategorization]{ref}
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