6533b830fe1ef96bd1296f99

RESEARCH PRODUCT

Howard–Dolman stereovision test at different opponent colour stimuli

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The purpose of this study was to investigate visual depth perception of real physical colour stimuli with red-green and blue-yellow opponency. We modified the Howard–Dolman stereotest where subjects should determine the closer of two bars emitting the light of definite colour placed in front of a CRT monitor served as colour background. Two-alternative forced-choice paradigms were used to determine depth perception threshold values. Thresholds close to 5–10 arcsec for luminance and colour contrast stimuli were revealed both for red-green and blue-yellow stimuli. A term, stereosensitivity – a reciprocal magnitude of the stereothreshold – was introduced to separately analyse luminance and colour contrast contributions in total depth perception. Comparing stereo sensitivity values for different colour stimuli, stereo sensitivity in case of red-green is still better than comparing to blue-yellow colour contrast. The colour and luminance contrast in CIE L*a*b* units (at least in the restricted dynamic range) c...