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How surrounds affect chromaticity discrimination

E Miyahara1, V C Smith, J Pokorny

  • 1Visual Sciences Center, University of Chicago, Illinois 60637.

Journal of the Optical Society of America. A, Optics and Image Science
|April 1, 1993
PubMed
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Chromatic discrimination thresholds depend on surround conditions. Short-wavelength-sensitive (SWS) cone discrimination is influenced by SWS excitation levels and surround color, while long- and medium-wavelength-sensitive (LWS/MWS) cone discrimination is V-shaped, deepened by yellow/white surrounds.

Area of Science:

  • Visual perception
  • Color vision science
  • Human psychophysics

Background:

  • Chromatic discrimination is fundamental to visual perception.
  • Understanding how cone-specific excitations and surround conditions modulate color perception is crucial.

Purpose of the Study:

  • To investigate the impact of different surround conditions on chromatic discrimination thresholds.
  • To elucidate the roles of short-wavelength-sensitive (SWS) and long-/medium-wavelength-sensitive (LWS/MWS) cones in chromatic discrimination.

Main Methods:

  • Measured chromatic discrimination thresholds along two cardinal axes of chromaticity space.
  • Varied SWS-cone excitation while keeping LWS/MWS constant, and vice versa.
  • Tested conditions with dark, white, and yellow surrounds.

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Main Results:

  • SWS cone discrimination, with a dark surround, followed a threshold-versus-radiance function.
  • With white or yellow surrounds, SWS cone discrimination showed a V-shaped function, with a minimum at the surround's excitation level.
  • LWS/MWS cone discrimination showed a V-shaped function with a dark surround, which was deepened by yellow/white surrounds.

Conclusions:

  • Chromatic discrimination is significantly modulated by surround chromaticity and luminance.
  • A model incorporating threshold, cone gain, and opponent gain controls can describe the observed data for SWS and LWS/MWS cone discrimination.