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Insufficiently revising beliefs when presented with new evidence. Change is hard, so let's just make tiny adjustments.
Slows adaptation to new information, maintains outdated stereotypes, and prevents learning from feedback.
People typically update their beliefs by only 10-20% of what they should based on new evidence, leading to persistent misconceptions.
"Good news: You're not as unique as you think. Bad news: You're not as rational as you think either."