In-Group/Out-Group Bias
Updated 2026-08-17
INTRODUCTION
English translation pending.
CORE DEFINITION
In-group and out-group bias describes the systematic preference for one's own group and the corresponding devaluation of outsiders. Henri Tajfel and colleagues demonstrated it in the minimal group experiments of the early 1970s, where strangers split into groups by trivial criteria still allocated more rewards to their own side. Tajfel and John Turner later built social identity theory on this finding, arguing that people derive part of their self-concept from group membership, so favouring the in-group also serves self-esteem. The bias needs no real conflict or material stake, which is what makes it so pervasive.
SCAFFOLDING EFFECT
Reduce cognitive load
- Category audit: Notice which group labels you applied before judging a person's argument or motive. - Shared-goal design: Build a concrete superordinate goal that neither side could reach alone. - Individual contact: Replace group stereotypes with specific, repeated one-to-one interaction over time.
Anchor fast decisions
Sorting people into groups is fast and cheap, so the mind uses membership as a shortcut for predicting trust and intent. Once a category is active, attention shifts toward information that confirms the group's virtues and away from disconfirming evidence, and the same behaviour reads as loyalty inside and as threat outside. Because self-esteem is partly tied to the group, defending it also defends the self.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- github.comhttps://github.com/kcchien/model-thinkingverified
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