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Related Experiment Video

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Averaging sets of expressive faces is modulated by eccentricity.

Michelle P S To1,2, Katherine M Carvey2, Richard J Carvey2

  • 1Department of Psychology, Lancaster University, Lancaster, UK.

Journal of Vision
|September 4, 2019
PubMed
Summary

Participants can extract average facial expressions, with performance improving in the parafovea. This suggests peripheral mechanisms facilitate averaging, and compulsory averaging occurs outside the fovea.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Visual perception

Background:

  • Facial expression averaging is possible at fixation.
  • Eccentricity may impact visual processing due to limited neural resources.
  • Compulsory averaging for visual features has been previously observed.

Purpose of the Study:

  • Investigate how eccentricity affects facial expression averaging.
  • Determine if compulsory averaging occurs in the parafovea for facial expressions.
  • Compare averaging and substitution models in relation to crowding.

Main Methods:

  • Participants viewed sets of expressive faces at fixation or 3° eccentricity.
  • Tasks involved identifying the central face's expression or the set's average expression.
  • Performance was analyzed based on eccentricity and task type.

Main Results:

  • Facial expression averaging was successful both centrally and peripherally.
  • Performance was superior in the parafovea, indicating peripheral facilitation.
  • Compulsory averaging was observed in the parafovea, unlike central foveal processing.
  • Data supported averaging models over substitution models of crowding.

Conclusions:

  • Eccentricity significantly influences the ability to process facial expressions.
  • Peripheral mechanisms may facilitate facial expression averaging.
  • Compulsory averaging in the parafovea impacts facial expression perception.