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Related Experiment Video

Updated: Apr 15, 2026

Using the Race Model Inequality to Quantify Behavioral Multisensory Integration Effects
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Deciding on race: a diffusion model analysis of race-categorisation

Christopher P Benton1, Andrew L Skinner2

  • 1Department of Experimental Psychology, University of Bristol, 12a Priory Road, Bristol BS8 1TU, UK.

Cognition
|March 24, 2015
PubMed
Summary

Keywords:
AdaptationCognitive modellingDiffusion modelOther-racePerceptionRace categorisation

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Area of Science:

  • Psychology
  • Social Psychology
  • Perception

Background:

  • Racial categorization influences intergroup decision-making.
  • Accurate race categorization is a prerequisite for race-based behavior.
  • Previous research indicates differences in how racial groups categorize faces.

Purpose of the Study:

  • To investigate the cognitive processes underlying race categorization.
  • To determine if differences in perceptual sensitivity or prior bias explain intergroup categorization discrepancies.
  • To examine how Asian and Caucasian individuals categorize facial images across a racial spectrum.

Main Methods:

  • Utilized a two-choice reaction time task with Asian and Caucasian participants.
  • Presented participants with facial images varying in racial features (Asian to Caucasian).
  • Applied the Ratcliff diffusion model to analyze decision-making processes, including evidence accumulation and a priori bias.

Main Results:

  • A distinct category boundary difference was observed between Asian and Caucasian participants.
  • Asian participants were more likely to classify intermediate faces as Caucasian, and vice versa.
  • No significant difference in a priori bias was found; however, differences in evidence accumulation rates were evident.

Conclusions:

  • Differences in perceptual sensitivity to race-specific visual cues drive race categorization boundaries.
  • Asian participants showed heightened sensitivity to Caucasian cues, and Caucasian participants to Asian cues.
  • Findings support the role of perceptual adaptation in own-race versus other-race face processing.