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Chromatic discrimination data show that a smaller physical stimulus change is required to detect a change in hue than to detect a change in saturation [Palette 30, 21 (1968); Proc. R. Soc. London Ser. B 283, 20160164 (2016)], and, on this basis, it has been suggested that hue and saturation are carried in different neural channels [Color Space and Its Divisions: Color Order from Antiquity to the Present (Wiley, 2003), p. 311]. We used an adaptation paradigm to test explicitly for separatedoi:10.1364/josaa.35.00b299 pmid:29603964 fatcat:3yequt4kl5a5bkflus4xbuima4