The widely documented "outgroup homogeneity effect" refers to people's tendency to view members of groups to which they do not belong (outgroups) as more similar to one another than members of their own groups (ingroups). Here, we present evidence for a novel but related phenomenon: People tend to view members of different minority groups as collectively more similar to one another than members of the majority group are to one another. Across nine studies (and four studies reported in the Supplemental Materials), we demonstrate a robust "minority-groups homogeneity effect" among participants from both majority groups (Studies 1-5) and minority groups (Studies 6-8), albeit less consistently among the latter. We provide experimental support for the role of beliefs in the common fate of minorities in driving this effect: When participants are led to believe that minority groups do not share a common fate, they no longer rate them as more similar than the majority (Study 9). These studies shed light on a broad pattern of social perception that may influence how members of different groups interact with one another and how they respond to cultural and demographic changes in society. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

中文翻译：

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少数群体同质性效应：认为不同少数群体的成员比多数群体的成员更相似。


广泛记录的“外群体同质效应”是指人们倾向于认为他们不属于的群体（外群体）的成员比他们自己的群体（内群体）的成员更相似。在这里，我们为一个新颖但相关的现象提供了证据：人们倾向于将不同少数群体的成员集体视为彼此之间的相似度，而不是多数群体的成员之间的相似性。在 9 项研究（以及补充材料中报告的 4 项研究）中，我们证明了多数群体（研究 1-5）和少数群体（研究 6-8）的参与者之间存在强大的“少数群体同质效应”，尽管后者之间的一致性较低。我们为信念在少数群体共同命运中的作用提供了实验支持，以推动这种影响：当参与者被引导相信少数群体没有共同的命运时，他们不再认为他们比大多数人更相似（研究 9）。这些研究揭示了一种广泛的社会观念模式，这些模式可能会影响不同群体的成员如何相互互动以及他们如何应对社会中的文化和人口变化。（PsycInfo 数据库记录 （c） 2024 APA，保留所有权利）。