How Does a Voluntary Smile Typically Differ from a Full

question 125

Multiple Choice

How does a voluntary smile typically differ from a full, spontaneous, Duchenne smile?

• A) Only Duchenne smiles include contractions of the muscles around the eyes.
• B) Only voluntary smiles include a parting of the lips to reveal the teeth.
• C) Voluntary smiles have more of an upward curve.
• D) The Duchenne smile involves clenched teeth; the voluntary smile has a relaxed jaw.

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