Redundancy gain in discrimination of colored lights: Effects of complexity and eccentricity

Yoshiaki Nakajima*, Satoru Kawamura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The present study investigated the redundancy gain in discrimination of colored lights. Subjects were requested to discriminate a target from 34 nontarget lights differing from the target in luminance, hue, or both, and RTs were recorded. Experimental variables were the complexity of stimulus pattern and the eccentricity of the target in visual angle. The 35 lights were arranged regularly on an imaginary grid in the low-complexity condition and were arranged randomly in the high-complexity condition. The eccentricity of target was varied from 0° to 16°. Only when the stimulus pattern was highly complex and eccentricity was large, the combination of luminance and hue made the subject's discrimination faster than when luminance or hue individually operated as a cue for discrimination. That is, a redundant target effect was found only for a highly complex stimulus pattern and in peripheral vision.

Original languageEnglish
Pages (from-to)691-697
Number of pages7
JournalPerceptual and Motor Skills
Issue number2
Publication statusPublished - 1998

ASJC Scopus subject areas

  • Psychology(all)
  • Experimental and Cognitive Psychology


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