Your face communicates even when you are silent. Research supports an important role for facial expressions and body language, but there is no universal percentage for their contribution to every interaction.

The 7-38-55 Rule

Albert Mehrabian's (1971) communication research suggested that when a message is about feelings or attitudes:

  • 7% of impact comes from words
  • 38% comes from tone of voice
  • 55% comes from facial expressions and body language

These percentages apply narrowly to messages about feelings and attitudes when verbal and nonverbal cues conflict. They should not be generalized to all communication. Broader research still supports nonverbal behavior as one important part of interpersonal perception.

Facial Expressions and Professional Outcomes

Research by Ambady and Rosenthal (1993) — their famous "thin slices" study — found that observers watching just 30 seconds of silent video could predict teacher effectiveness ratings with remarkable accuracy. The key predictors were facial warmth, enthusiasm, and confidence.

Similarly, Carney, Colvin, and Hall (2007) found that thin-slice judgments from brief exposures to nonverbal behavior predicted:

  • Job interview outcomes
  • Sales performance
  • Negotiation results
  • Leadership evaluations

Key Facial Expressions for Success

The Duchenne Smile

Named after French neurologist Guillaume Duchenne, this genuine smile engages both the mouth muscles (zygomatic major) and the muscles around the eyes (orbicularis oculi). In retrospective, correlational studies, Hertenstein et al. (2009) found that smile intensity in old photographs was associated with later divorce outcomes. A photograph does not determine relationship success.

Eye Contact

Appropriate eye contact signals confidence and engagement. Kleinke (1986) in Psychological Bulletin found that moderate eye contact (60–70% of conversation time) maximizes perceived trustworthiness and competence.

Resting Face

Your "resting face" — the expression you wear when not actively communicating — significantly impacts how others perceive you. Research on "resting bitch face" by Macbeth and Davis (2018) used facial action coding to show that specific facial configurations at rest communicate unintended emotions.

The Face-Body Connection

Facial expressions don't operate in isolation. Cuddy, Wilmuth, and Carney (2012) found that "power posing" — expansive body postures — affected facial expression and perceived confidence. This suggests that a comprehensive approach to nonverbal presence should address both face and body.

Optimizing Your Nonverbal Presence

  1. Know your resting face: Tools like AI face analysis can help you understand how your neutral expression is perceived by others
  2. Practice genuine smiling: Duchenne smiles can be practiced by thinking of genuinely positive memories
  3. Record yourself: Video self-review reveals nonverbal habits invisible to self-reflection
  4. Work on eye contact: Practice the 60–70% rule in conversations
  5. Integrate face and body: Ensure your facial expressions match your body language for coherent communication

Key Research References

  • Mehrabian, A. (1971). Silent Messages. Wadsworth.
  • Ambady, N. & Rosenthal, R. (1993). "Half a Minute: Predicting Teacher Evaluations." Journal of Personality and Social Psychology, 64(3), 431–441.
  • Hertenstein, M.J. et al. (2009). "Smile Intensity in Photographs Predicts Divorce Later in Life." Motivation and Emotion, 33(2), 99–105.
  • Kleinke, C.L. (1986). "Gaze and Eye Contact: A Research Review." Psychological Bulletin, 100(1), 78–100.