A nerve cell that fires both when a person acts and when a person observes the same action performed by someone else, as if the observer himself or herself were acting:

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Quizplus · Accepted Answer

Mirror neurons are the type of nerve cells that activate both when an individual performs an action and when they observe the same action being performed by someone else, creating a mirroring effect as if the observer were themselves performing the action.

A Nerve Cell That Fires Both When a Person Acts