Research note: a multidimensional scaling comparison of color metrics for response times and rated dissimilarities.
Individual-differences multidimensional scaling was applied to a set of proximity data for equiluminant lights (Paramei & Cavonius, 1999) to explore any differences between two data collection procedures (rated dissimilarities, and same/different response times [RTs]), as well as between color-normal and abnormal observers. Two conclusions emerged: (1) The pattern of similarities from observers with anomalous color vision can be understood in terms of a compressed color plane (the weighted Euclidean model of individual differences); and (2) there is evidence that the color "plane" is either curved or governed by a non-Euclidean distance function. When color-normal observers are examined in the weighted-Euclidean framework, minor differences emerge between RT and rating data. But the main distinguishing feature of RT data is a pattern of decreasing accuracy for larger color distances. This must be taken into account, since it can itself induce curvature.
Bimler
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Department of Educational Studies and Community Support, Massey University, Palmerston North, New Zealand. d.bimler@massey.ac.nz
D003118:Color Perception; D003119:Color Perception Tests; D003117:Color Vision Defects / Q000175:diagnosis / Q000523:psychology; D003867:Depth Perception; D004193:Discrimination Learning; D006801:Humans; D007206:Individuality; D011601:Psychophysics; D011930:Reaction Time