Oddly Wired
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social dynamics

You judge other people using your own internal state.

The 'False Consensus Effect', an example of egocentric bias, is the tendency to overestimate the extent to which others share your opinions, beliefs, and behaviors.

Ross, L., Greene, D., & House, P. (1977). The 'false consensus effect': An egocentric bias in social perception and attribution processes. Journal of Experimental Social Psychology.

You are usually interpreting a mirror, not a person.

Where this comes from

Study
Ross, Greene, & House, 1977, Journal of Experimental Social Psychology
What the check found
The definition is accurate to psychological literature, but the source cited is a foundational paper for the 'False Consensus Effect' specifically, not the primary source for the general term 'egocentric bias'.
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.