Are hue and saturation carried in different neural channels?

Sarah E. Regan, Robert J. Lee, Donald I. A. MacLeod, Hannah E. Smithson
2018 Optical Society of America. Journal A: Optics, Image Science, and Vision  
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 separate
more » ... for separate mechanisms, measuring hue and saturation detection thresholds before and after adaptation to hue and saturation stimuli. Within-condition adaptation did not elevate detection thresholds significantly more than between-condition adaptation. We therefore did not find psychophysical evidence for a neural channel that extracts hue thresholds more effectively than the neural channel or channels that determine saturation thresholds.
doi:10.1364/josaa.35.00b299 pmid:29603964 fatcat:3yequt4kl5a5bkflus4xbuima4