They.si
The social psychology of us versus them
Every human group draws a line between us and them, and that line shapes prejudice, politics, and everyday misunderstanding. Learn the social psychology of ingroup and outgroup dynamics, and the research on what actually reduces division.
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What you get
Everything They.si gives you
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Theory explainer
Social identity theory and the psychology of group belonging.
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Research summaries
Peer-reviewed findings on prejudice and division.
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Case studies
How ingroup and outgroup dynamics show up in real settings.
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Us and Them: The Research
Core concepts in intergroup social psychology.
Ingroup/Outgroup Psychology
- Social Identity Theory — Tajfel and Turner's theory that self-esteem is partly tied to group membership.
- Minimal Group Paradigm — Experiments showing favoritism emerges even with arbitrary, meaningless group divisions.
How Othering Works
- Stereotyping — Applying generalized traits to all members of a group, ignoring individual variation.
- Outgroup Homogeneity Effect — The tendency to see outgroup members as more similar to each other than they really are.
- Dehumanization — Framing an outgroup as less than fully human, a documented precursor to real-world harm.
Reducing Division
- Contact Hypothesis — Allport's finding that structured, equal-status contact between groups reduces prejudice.
- Perspective-Taking — Deliberately imagining another group's experience measurably reduces bias in studies.
- Superordinate Goals — Shared goals that require cooperation across group lines reduce intergroup conflict.
Real-World Applications
- Workplace Teams — Cross-functional teams show how shared goals can dissolve in-group silos.
- Sports Rivalries — A widely studied, low-stakes example of ingroup loyalty and outgroup bias.
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