Definition
Mirror neurons are nerve cells, first identified in the premotor cortex of macaque monkeys, that activate both when an animal performs a specific action and when it watches another individual perform that same action. The cell mirrors observed behavior onto the observer's own motor system.
The discovery prompted the hypothesis that a similar mirroring system in humans supports imitation, action understanding, and possibly empathy. It is important to note that this remains an active area of debate; the strong claim that mirror neurons fully explain empathy is contested by many researchers.
Why it matters
How it works
The proposed mechanism is internal simulation. When you watch someone reach for a cup, mirror-related circuits partially activate the same motor representations you would use to reach yourself. This shared coding may let you grasp the action's goal directly, without conscious reasoning.
Extended to emotion, the idea is that observing a facial expression or posture triggers a faint version of the corresponding state in the observer, producing emotional resonance. This may underlie phenomena like contagious yawning, mimicked posture, and the way rapport builds when two people unconsciously match each other. Practitioners of influence sometimes mirror posture and tone deliberately to manufacture that sense of rapport.