Oddly Wired
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perception

You think your inner state is visible to everyone.

The 'illusion of transparency' is a verified psychological phenomenon where individuals overestimate the extent to which their internal states are visible to others.

The provided source material references experiments on public speaking anxiety, not the drink-deception experiment described in the claim.

Your anxiety about being exposed is usually a solitary experience.

Where this comes from

Study
Gilovich, Savitsky, and Medvec, 1998
What the check found
The core psychological phenomenon is real and well-documented, but the specific experimental evidence cited is not present in the provided source material.
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.