Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/18288
Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Saliency interactions between the 'L-M' and 'S' cardinal colour directions
Authors: Kingdom, Frederick A A
Kardous, Natacha
Curran, Laura
Gheorghiu, Elena
Bell, Jason
Contact Email: elena.gheorghiu@stir.ac.uk
Keywords: Colour vision
Saliency interactions
Cardinal colours
Issue Date: Feb-2014
Publisher: Elsevier
Citation: Kingdom FAA, Kardous N, Curran L, Gheorghiu E & Bell J (2014) Saliency interactions between the 'L-M' and 'S' cardinal colour directions, Vision Research, 95, pp. 36-42.
Abstract: Two sub-systems characterize the early stages of human colour vision, the ‘L-M' system that differences L and M cone signals and the ‘S' system that differences S cone signals from the sum of L and M cone signals. How do they interact at suprathreshold contrast levels? To address this question we employed the method used by Kingdom et al. (2010) to study suprathreshold interactions between luminance and colour contrast. The stimulus employed in one condition was similar to that used by Regan and Mollon (1997) for studying the relative ‘organizing power' of the two sub-systems, and consisted of obliquely-oriented red-cyan (to isolate the L-M sub-system) and violet-chartreuse (to isolate the S sub-system) stripes within a lattice of circles. In our experiment there were two conditions, (1) the Separated condition, in which the L-M and S modulations were of opposite orientation and presented separately as a forced-choice pair, and (2) the Combined condition, in which the L-M and S modulations were added. In the Separated condition the task was to indicate the stimulus with the more salient orientation structure, whereas in the Combined condition the task was to indicate the orientation that was more salient. Psychometric functions were used to estimate the ratio of L-M to S contrast at the ‘balance-point' i.e. point-of-subjective-equality (PSE) in both conditions. We found that across 20 subjects an average of 8% more S than L-M contrast was needed to achieve a PSE in the Combined compared to Separated condition. We consider possible reasons for this PSE difference and conclude that it is either due to an early-stage interaction between the S and L-M sub-systems, or to a later stage in which new colours that arise from their combination are selectively grouped.
Type: Journal Article
URI: http://hdl.handle.net/1893/18288
DOI Link: http://dx.doi.org/10.1016/j.visres.2013.12.004
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: McGill University
McGill University
McGill University
Psychology
University of Western Australia

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