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Contextual Effects in Face Lightness Perception Are Not Expertise-Dependent.

Dorita H F Chang1,2, Yin Yan Cheang1, May So1

  • 1Department of Psychology, The University of Hong Kong, Hong Kong, China.

Vision (Basel, Switzerland)
|November 19, 2019
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Summary

Face lightness perception is influenced by race context, but this effect is similar across different racial groups. Expertise did not significantly alter these contextual influences on lightness judgments.

Keywords:
contextual effectsface perceptionlightness perceptionother-race effect

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Area of Science:

  • Visual perception
  • Social cognition
  • Psychophysics

Background:

  • Lightness judgments of faces are known to be influenced by contextual factors, including race.
  • The 'other-race effect' describes how individuals are less accurate at recognizing faces of different races.

Purpose of the Study:

  • To investigate if expertise modulates contextual effects in face lightness perception.
  • To determine if the other-race effect influences lightness judgments based on race.

Main Methods:

  • A lightness-matching paradigm was employed with Chinese and White observers.
  • Participants adjusted a variable face's lightness to match a standard face.
  • The race of the standard and variable faces was systematically varied (same vs. different race).

Main Results:

  • Both observer groups showed the smallest matching errors when faces were of the same race.
  • Matching errors were largest (negative) when the reference face was Black, irrespective of observer race.
  • Errors for Chinese and White reference faces were near zero or positive, with no significant difference between observer groups.

Conclusions:

  • Contextual influences on face lightness perception are not driven by classical face perception mechanisms.
  • These effects may arise from an interaction between race-based assumptions and surface reflectance computations.
  • Expertise, as related to the other-race effect, does not appear to modulate race-based contextual influences in lightness perception.