Oddly Wired
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communication

You find it impossible to ignore what you already know.

The curse of knowledge causes you to overestimate how well others understand what you are explaining.

Once you learn a concept, your brain struggles to imagine the perspective of someone who does not have that information. You instinctively assume that because something is obvious to you, it must be clear to everyone else.

You are a worse teacher than you realize simply because you can no longer remember being a beginner.

Where this comes from

Study
Elizabeth Newton, 1990 study on tapping melodies
What the check found
While the reference material provided did not contain the specific study, the effect is a well-established cognitive bias in behavioral science primarily attributed to this specific experiment.
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.