Oddly Wired
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conformity

You change your opinion to avoid social isolation.

In a 1951 experiment, 74% of participants went along with an obviously incorrect group judgment at least once.

The finding was 74%, not 75%. Not all participants conformed purely to avoid disagreement; some reported they actually perceived the incorrect lines as matching.

You will deny your own senses to stay in the group.

Where this comes from

Study
Solomon Asch, 1951, Journal of Abnormal and Social Psychology
What the check found
The percentage is slightly inflated; the study found 74%. Additionally, the motivation was not uniform across all subjects.
Confidence
Well replicated

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.