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Updated: May 10, 2026

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues
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Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

Published on: June 3, 2013

Categorical sensitivity to color differences.

Christoph Witzel1, Karl R Gegenfurtner

  • 1Department of Psychology, University of Giessen, Giessen, Germany. christoph.witzel@psychol.uni-giessen.de

Journal of Vision
|June 5, 2013
PubMed
Summary
This summary is machine-generated.

Color perception and language categories have a loose link. Our study found that while some color category boundaries align with discrimination differences, this isn't universal, challenging the idea that color naming dictates perception.

Keywords:
Sapir-Whorf-hypothesiscategorical perceptioncolor categorizationcolor discriminationcolor naminglanguage and perceptionsecond-stage mechanisms

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Area of Science:

  • Visual perception
  • Color science
  • Psycholinguistics

Background:

  • Categorical perception suggests a link between sensory input and linguistic categories for basic color terms.
  • Previous research often focused on specific boundaries, like blue-green, without a comprehensive view.

Purpose of the Study:

  • To investigate if sensory information processing leads to categorical perception of color differences.
  • To determine if color discrimination sensitivity is higher across than within category boundaries.
  • To examine the relationship between color categorization and discrimination across different lightness levels.

Main Methods:

  • Measured just-noticeable differences (JNDs) and color categories in the Derrington-Krauskopf-Lennie (DKL) color space.
  • Utilized an isoluminant hue circle at three lightness levels.
  • Analyzed JND patterns relative to established color category borders.

Main Results:

  • At isoluminant lightness, JND patterns showed minima near orange-pink and blue-green boundaries, but these also aligned with cone-opponent mechanisms.
  • No consistent evidence for categorical perception was found across all tested category borders.
  • Color categories shifted significantly at lower lightness levels, but JNDs did not correlate with these changes.

Conclusions:

  • There is a loose relationship between color categorization and discrimination, not a direct causal link.
  • The alignment of some boundaries with JND minima is not a general rule for color categories.
  • Findings challenge the notion that color naming is the basis for categorical color perception and emphasize the need for comprehensive category analysis.