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Charles Darwin proposed that facial expressions are an evolutionary adaptation for communication. He argued that these expressions are not influenced by culture but are universal across species. For example, a snarling expression with exposed teeth signals a threat in many animals, including humans. Darwin also suggested that displaying an emotion can intensify the feeling. Smiling, for example, could enhance one's sense of happiness. This idea laid the foundation for understanding the role...
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Related Experiment Video

Updated: Mar 29, 2026

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
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Inducing a concurrent motor load reduces categorization precision for facial expressions.

Alberta Ipser1, Richard Cook1

  • 1Department of Psychology, City University London.

Journal of Experimental Psychology. Human Perception and Performance
|December 1, 2015
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Summary

Motor theories suggest facial expression perception involves self-simulation. This study found that producing vowel sounds, a motor load, reduced smile sincerity judgment precision, supporting motor contributions to expression perception.

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Area of Science:

  • Psychology
  • Cognitive Neuroscience
  • Social Psychology

Background:

  • Motor theories propose facial expression perception relies on internal motor simulation.
  • Previous studies suggest blocking facial mimicry impacts expression labeling and ratings, but the cause (perception vs. bias) is debated.

Purpose of the Study:

  • To investigate motor contributions to expression perception using a novel psychophysical paradigm.
  • To determine if motor load affects the precision of judging smile sincerity.

Main Methods:

  • Developed a new psychophysical task to assess smile sincerity judgments.
  • Introduced motor load via concurrent vowel sound production.
  • Controlled for passive listening and non-expression categorizations (gender).

Main Results:

  • Smile sincerity judgments rely on both eye and mouth cues.
  • Producing vowel sounds significantly reduced the precision of smile sincerity categorization.
  • This effect was specific to active vowel production, not passive listening.
  • Gender categorization accuracy was unaffected by motor load.

Conclusions:

  • Motor load, induced by active vowel production, impairs the precision of expression perception.
  • Findings support the role of motor simulation in expression perception, distinguishing it from response bias.
  • This research provides robust evidence for motor contributions to facial expression interpretation.