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Related Experiment Videos

Smiles when lying.

P Ekman1, W V Friesen, M O'Sullivan

  • 1Department of Psychiatry, University of California, San Francisco 94143.

Journal of Personality and Social Psychology
|March 1, 1988
PubMed
Summary
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Genuine smiles involve eye muscle activity, unlike feigned smiles used to mask negative emotions. Recognizing these subtle facial expression differences is key to distinguishing truthful enjoyment from deception.

Area of Science:

  • Psychology
  • Nonverbal Communication
  • Emotion Science

Background:

  • Facial expressions, particularly smiles, are crucial in conveying emotions.
  • Previous research often treated smiling as a uniform expression, potentially overlooking nuanced variations.

Purpose of the Study:

  • To investigate subtle differences in facial expressions during genuine versus feigned positive emotions.
  • To determine if specific muscular patterns in smiles correlate with authentic enjoyment versus deception.

Main Methods:

  • Observational analysis of facial muscle activity during self-reported genuine and feigned positive emotional states.
  • Comparison of smile characteristics, focusing on periorbital (eye area) and lip muscle engagement.

Main Results:

Related Experiment Videos

  • Smiles incorporating eye muscle activity (Duchenne markers) were more frequent during genuine enjoyment.
  • Smiles with traces of negative emotion-associated muscle actions (e.g., disgust, fear) appeared more often when masking negative feelings.
  • Treating smiles as a single phenomenon obscured these crucial distinctions between truthful and deceptive displays.

Conclusions:

  • Subtle, involuntary facial muscle movements differentiate genuine positive affect from feigned happiness.
  • Accurate interpretation of deception requires analyzing the full spectrum of facial expressions, not just lip movements.
  • The study highlights the importance of microexpressions in understanding emotional authenticity and detecting deception.