Research shows if your eyes wrinkle when you smile or frown, you appear more sincere
Why We Smile And How To Spot A Fake One
Children's and adolescents' perception of the authenticity of smiles. | Semantic Scholar
A smile biases the recognition of eye expressions: Configural projection from a salient mouth - Manuel G. Calvo, Andrés Fernández-Martín, Lauri Nummenmaa, 2013
The use of the Duchenne marker and symmetry of the expression in the judgment of smiles in schizophrenia - ScienceDirect
Differential Reliance on the Duchenne Marker During Smile Evaluations and Person Judgments | SpringerLink
A) Examples of the three smile types in the Smile Picture Set. From... | Download Scientific Diagram
Smiling and Courtship! Does Smiling Increase Male Attractiveness? – Evolved Psychology