Oddly Wired
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attention

You do not see what you are not expecting.

Highly focused attention can lead to inattentional blindness, where the rate of missing unexpected events ranges from 8% to 83% depending on the difficulty of the primary task.

The 'nearly half' figure simplifies a wide range of results recorded in the Simons & Chabris (1999) study.

You are only seeing what you are currently looking for.

Where this comes from

Study
Simons & Chabris (1999)
What the check found
While the core phenomenon is real, the specific number of 'nearly half' obscures that the rate was highly dependent on experimental conditions.
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.