title: Neurophysiological evidence for categorical perception of color.
abstract: The aim of this investigation was to examine the time course and the relative contributions of perceptual and post-perceptual processes to categorical perception (CP) of color. A visual oddball task was used with standard and deviant stimuli from same (within-category) or different (between-category) categories, with chromatic separations for within- and between-category stimuli equated in Munsell Hue. CP was found on a behavioral version of the task, with faster RTs and greater accuracy for between- compared to within-category stimuli. On a neurophysiological version of the task, event-related potentials (ERPs) showed earlier latencies for P1 and N1 components at posterior locations to between- relative to within-category deviants, providing novel evidence for early perceptual processes on color CP. Enhanced P2 and P3 waves were also found for between- compared to within-category stimuli, indicating a role for later post-perceptual processes.
authors.affiliation: School of Human and Life Sciences, Roehampton University, Whitelands College, Holybourne Avenue, West Hill, London SW154JD, UK. a.holmes@roehampton.ac.uk
authors.forename: Amanda
authors.initials: A
authors.lastname: Holmes
authors.forename: Anna
authors.initials: A
authors.lastname: Franklin
authors.forename: Alexandra
authors.initials: A
authors.lastname: Clifford
authors.forename: Ian
authors.initials: I
authors.lastname: Davies
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001921:Brain / Q000502:physiology*; D003071:Cognition / Q000502:physiology*; D003118:Color Perception / Q000502:physiology*; D004569:Electroencephalography; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D011930:Reaction Time; D013647:Task Performance and Analysis; D055815:Young Adult