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Quantifying the Wollaston Illusion.

Heiko Hecht1, Stefanie Siebrand1, Sven Thönes1

  • 1Department of Psychology, Johannes Gutenberg-Universität Mainz, Mainz, Germany.

Perception
|April 14, 2020
PubMed
Summary
This summary is machine-generated.

The Wollaston illusion demonstrates how facial features, not just eyes, influence perceived gaze direction. This study confirms that adding elements like eyebrows and noses can alter gaze perception by up to 20 degrees.

Keywords:
Wollaston illusionfacial featuresgaze directionvisual perception

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Area of Science:

  • Visual perception
  • Psychophysics
  • Art history

Background:

  • William H. Wollaston's 19th-century illusion demonstrated altered perceived gaze direction using manipulated facial features.
  • Previous replications have not utilized Wollaston's original stimuli.

Purpose of the Study:

  • To replicate and investigate the Wollaston illusion using original stimuli.
  • To quantify the effect of various facial features on perceived gaze direction.

Main Methods:

  • Utilized the eye region (pupil and iris) from Wollaston's original engraving.
  • Measured perceived gaze direction analogously.
  • Systematically added facial features (eye socket, eyebrows, nose, skull, hair) to assess their impact.

Main Results:

  • Confirmed Wollaston's observation: added facial features altered perceived gaze direction.
  • The perceived gaze direction was diverted by up to 20 degrees.
  • The effect operates as an attractor, where head orientation cues influence gaze perception.

Conclusions:

  • Facial features significantly influence perceived gaze direction, extending beyond the eye region.
  • The Wollaston illusion is robust and reproducible with original stimuli.
  • The attractor effect explains how subtle cues can redirect perceived gaze.