In-Group Bias Definition | Psychology

In-group bias is when groups of humans act far more helpful and favorably towards members of their own group versus any outsiders. When people and psychologists talk about tribal behavior, when referring to their own group, this is what they mean. It’s a vast subject full of nuance that affects all of our lives.

From group identities based on ethnicity, sports teams, nationalities, religions, and families, we humans love forming in-groups and treating them more special than out-groups.

Probably the worst example of in-group bias is when your co-workers Martha and Jennifer team up for the monthly cook-off and secretly sabotage your award-winning peanut butter tuna sandwich. This, to them, is of course justified, because they make up Team JaMe (terrible name, I know), and thus treat me and my delicious sandwich as an outgroup. All completely justified within the context of in-group tribalism, of course.