Oddly Wired
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emotion

Your smile is involuntary and cannot be faked.

The Duchenne smile involves the contraction of the zygomatic major and the inferior part of the orbicularis oculi, though this action can often be performed voluntarily.

The orbicularis oculi is not strictly involuntary and can be activated voluntarily by many people.

People are often more sensitive to the authenticity of your expressions than you realize.

Where this comes from

Study
Ekman & Friesen, 1982
What the check found
The anatomical description is correct, but the assertion regarding the involuntariness of the muscle contraction is scientifically inaccurate as it is often subject to voluntary control.
Confidence
Solid, with limits
emotionnonverbalexpression

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.