title: Phases of daylight and the stability of color perception in the near peripheral human retina.
abstract: Typical daylight extends from blue (morning sky) to orangey red (evening sky) and is represented mathematically as the Daylight Locus in color space. In this study, we investigate the impact of this daylight variation on human color vision. Thirty-eight color normal human observers performed an asymmetric color match in the near peripheral visual field. Unique hues were identified using a naming paradigm. The observers' performance for matching was almost perfectly coincident with the Daylight Locus but declined markedly in other regions. Interobserver variability reached a conspicuous minimum adjacent to the Daylight Locus and was maximal in the red and yellowish-green regions. In the naming task, unique blue and yellow were virtually coincident with the Daylight Locus. The results suggest that the mechanisms of color perception mediated by the phylogenetically older (blue-yellow) color pathway have been strongly influenced by the different phases of daylight.
authors.affiliation: The University of Manchester, Manchester, UK. apanorgias@ucdavis.edu
authors.forename: Athanasios
authors.initials: A
authors.lastname: Panorgias
authors.forename: Janus J
authors.initials: JJ
authors.lastname: Kulikowski
authors.forename: Neil R A
authors.initials: NR
authors.lastname: Parry
authors.forename: Declan J
authors.initials: DJ
authors.lastname: McKeefry
authors.forename: Ian J
authors.initials: IJ
authors.lastname: Murray
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D005075:Biological Evolution; D003116:Color; D003118:Color Perception / Q000502:physiology*; D055253:Color Vision / Q000502:physiology*; D005260:Female; D006801:Humans; D008029:Lighting; D008297:Male; D008959:Models, Neurological; D010775:Photic Stimulation / Q000379:methods; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*; D055815:Young Adult