Oddly Wired
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perception

You are blind to dramatic changes in your environment.

Change blindness is the failure to notice significant visual alterations during a brief interruption or distraction.

In a 1998 study, half of the pedestrians who stopped to give directions to an experimenter did not notice when the experimenter was replaced by a different person behind a moving board. Your brain creates a cohesive model of the world and ignores minor data mismatches.

You see what your brain expects, not what is there.

Where this comes from

Study
Daniel Simons, 1998
What the check found
The study described is the seminal 'door study' by Simons and Levin (1998). The claim is factually accurate regarding the phenomenon, though the source attribution is often simplified.
Confidence
Solid, with limits

Related

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