Abstract

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) [CrossRef]  ], 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 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.

© 2018 Optical Society of America

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Supplementary Material (7)

NameDescription
» Visualization 1       Movie of the 0 deg phase-shifted (diagonal right) saturation test stimulus whose chromaticity specifications are given in Figs. 1(a.i) and 1(a.v) and whose spatial specifications are given in Fig. 1(b).
» Visualization 2       Movie of the 180 deg phase-shifted (diagonal left) saturation test stimulus whose chromaticity specifications are given in Figs. 1(a.ii) and 1(a.vi) and whose spatial specifications are given in Fig. 1(b).
» Visualization 3       Movie of the −90 deg phase-shifted (clockwise) hue test stimulus whose chromaticity specifications are given in Figs. 1(a.iii) and 1(a.vii) and whose spatial specifications are given in Fig. 1(b).
» Visualization 4       Movie of the 90 deg phase-shifted (anti-clockwise) hue test stimulus whose chromaticity specifications are given in Figs. 1(a.iv) and(a.viii) and whose spatial specifications are given in Fig. 1(b).
» Visualization 5       Movie of the 0 deg phase-shifted (diagonal right) saturation adaptation stimulus whose chromaticity specifications are given in Figs. 1(a.i) and 1(a.v).
» Visualization 6       Movie of the −90 deg phase-shifted (clockwise) hue adaptation stimulus whose chromaticity specifications are given in Figs. 1(a.iii) and 1(a.vii).
» Visualization 7       Movie of the overall time course of a hue-adaptation, saturation-test trial in Section 2.E.4.

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Figures (5)

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