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Saliency interactions between the 'L-M' and 'S' cardinal colour directions

Kingdom, Frederick A A; Kardous, Natacha; Curran, Laura; Gheorghiu, Elena; Bell, Jason

Description

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...[Show more]

dc.contributor.authorKingdom, Frederick A A
dc.contributor.authorKardous, Natacha
dc.contributor.authorCurran, Laura
dc.contributor.authorGheorghiu, Elena
dc.contributor.authorBell, Jason
dc.date.accessioned2015-12-10T23:31:40Z
dc.identifier.issn0042-6989
dc.identifier.urihttp://hdl.handle.net/1885/68747
dc.description.abstractTwo 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.
dc.publisherPergamon-Elsevier Ltd
dc.sourceVision Research
dc.titleSaliency interactions between the 'L-M' and 'S' cardinal colour directions
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume95
dc.date.issued2014
local.identifier.absfor110000 - MEDICAL AND HEALTH SCIENCES
local.identifier.ariespublicationU3488905xPUB1816
local.type.statusPublished Version
local.contributor.affiliationKingdom, Frederick A A, McGill University
local.contributor.affiliationKardous, Natacha, McGill Vision Research
local.contributor.affiliationCurran, Laura, McGill Vision Research
local.contributor.affiliationGheorghiu, Elena, University of Stirling
local.contributor.affiliationBell, Jason, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage36
local.bibliographicCitation.lastpage42
local.identifier.doi10.1016/j.visres.2013.12.004
dc.date.updated2015-12-10T11:16:04Z
local.identifier.scopusID2-s2.0-84891754767
local.identifier.thomsonID000330751400005
CollectionsANU Research Publications

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