But what is it about a smile that makes it feel sincere or fake? The answer lies in a blend of facial anatomy and emotional authenticity.

Fake or polite smiles, on the other hand, usually involve only the mouth muscles. The eyes remain wide or indifferent, and ...

What makes a smile feel sincere or fake is due to a surprising blend of facial anatomy, neurology and emotional authenticity ...

Overwork in health care workers is associated with structural brain changes, particularly in regions linked to cognition and emotion.