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The perceptual span for faces, or Facespan, was determined using a gaze-contingent spotlight technique. This study found that 7° of visual angle, or 45% of the face, is needed for optimal face recognition.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • The perceptual span, the information processed during a single fixation, is well-defined for reading.
  • However, the equivalent for face processing, the Facespan, remains undetermined.
  • Efficient face processing mechanisms are debated, highlighting the need to quantify visual span for faces.

Purpose of the Study:

  • To determine the Facespan, the minimal amount of facial information required for accurate face recognition.
  • To establish a benchmark for future research on factors influencing face perception.

Main Methods:

  • Utilized a gaze-contingent Spotlight technique in an old-new face recognition paradigm.
  • Parametrically varied the size of the information aperture (spotlight) to assess its effect on recognition accuracy.
  • Employed Structural Similarity analysis to compare performance under spotlight and natural viewing conditions.

Main Results:

  • Face recognition accuracy increased nonlinearly with increasing spotlight aperture size.
  • The Facespan was determined to be 7° of visual angle under the tested conditions (45% of the face stimulus).
  • This 7° span provided performance comparable to natural viewing conditions.

Conclusions:

  • The study quantifies the Facespan, providing a critical metric for face perception research.
  • Findings suggest a specific visual extent is crucial for efficient face recognition.
  • The established Facespan serves as a foundation for exploring modulatory factors like development and individual differences.