In-Group Bias

Wat percentage of football fans helped an injured jogger ? 

  • Joggers wore same football team top : 92%
  • Joggers who wore rival football team top : 30%
  • Joggers who wore plain sports top : 25%

We are more positive toward people who are part of our ‘in-group’

See the full study here :

Levine, M., Prosser, A., Evans, D., & Reicher, S. (2005). Identity and Emergency Intervention: How Social Group Membership and Inclusiveness of Group Boundaries Shape Helping Behavior. Personality and Social Psychology Bulletin31(4), 443–453.

Want to know more about biases?

Curse of Knowledge

Zero-Sum Bias

Choice Overload