Felt, false, and miserable smiles

The Repertoire of Nonverbal Behavior: Categories, Origins, Usage, and Coding

Paul Ekman, Wallace V. Friesen · Semiotica · 1969 · 3.3K citations

Social Sciences, Communication, Social Psychology +12

Universals and cultural differences in facial expressions of emotion.

Paul Ekman · Medical Entomology and Zoology · 1972 · 2.2K citations

Social Sciences, Psychology, Social Psychology +14

Nonverbal Leakage and Clues to Deception^†

Paul Ekman, Wallace V. Friesen · Psychiatry · 1969 · 1.8K citations

Social Sciences, Behavioral Sciences, Psychology +17

Measuring facial movement

Paul Ekman, Wallace V. Friesen · Journal of Nonverbal Behavior · 1976 · 1.2K citations

Facial signs of emotional experience.

Paul Ekman, Wallace V. Freisen, Sonia Ancoli · Journal of Personality and Social Psychology · 1980 · 875 citations

Social Sciences, Behavioral Sciences, Psychology +14