Oddly Wired
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perspective

You use your own life as the ultimate metric.

The 'Curse of Knowledge' describes your tendency to over-rely on your own perspective when judging the knowledge of others.

The phenomenon described is formally defined as the 'Curse of Knowledge', whereas 'egocentric bias' refers to the broader tendency to favor one's own subjective view.

You often forget that what is obvious to you is unknown to everyone else.

Where this comes from

Study
Elizabeth Newton (1990) on the tapping experiment
What the check found
The definition provided describes the 'Curse of Knowledge.' While related to egocentricity, it is a distinct cognitive bias popularized by Camerer, Loewenstein, and Weber, and illustrated by Newton's tapping study.
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.