Watch for
Using sweeping generalisations about groups you do not belong to.
Social & PerceptionBias #41
Out-Group Homogeneity Effect
They all look the same to us.
The tendency to perceive members of an out-group as being far more similar to each other than members of our own group.
Why it matters: A core component of stereotyping and prejudice.
Try this
Seek out individual-level information about out-group members.
Real-world example
Thinking people from that political party all think alike while recognising nuance within your own party.
Key researchers
Patricia Linville, Edward Jones
First described in 1982
Psychological mechanism
Differential interaction and cognitive economy. For out-groups we rely on abstract category knowledge which compresses many individuals into a single prototype.
Seminal research
Patricia Linville and Edward E. Jones (1980), "Polarized appraisals of out-group members."
Related Biases
Below is a realistic scenario. Read it, then choose what you would do. The feedback will show whether a cognitive bias influenced your choice — not to judge, but to reveal the pattern in action.
Thought Experiment
This experiment places you in a realistic decision. Your instinctive choice will reveal whether bias is at work.
STEP 1 → ReadSTEP 2 → ChooseSTEP 3 → Reveal
Debrief
Biases are not character flaws. They are recurring patterns in how minds compress uncertainty, save energy, and narrate reality. Once you recognise the pattern, you can slow the decision down, test the assumption, and make space for a better explanation.
Sources
Original ResearchLinville and Jones (1980) — Original research
EducationalAPA Dictionary entry