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Cue Combination of Conflicting Color and Luminance Edges

McGraw, Paul; Sharman, Rebecca J; Peirce, Jonathan

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Authors

PAUL MCGRAW paul.mcgraw@nottingham.ac.uk
Professor of Visual Neuroscience

Rebecca J Sharman

Profile image of JONATHAN PEIRCE

JONATHAN PEIRCE JONATHAN.PEIRCE@NOTTINGHAM.AC.UK
Professor of Psychology Research Methods



Abstract

Abrupt changes in the color or luminance of a visual image potentially indicate object boundaries. Here, we consider how these cues to the visual “edge” location are combined when they conflict. We measured the extent to which localization of a compound edge can be predicted from a simple maximum likelihood estimation model using the reliability of chromatic (L−M) and luminance signals alone. Maximum likelihood estimation accurately predicted the pattern of results across a range of contrasts. Predictions consistently overestimated the relative influence of the luminance cue; although L−M is often considered a poor cue for localization, it was used more than expected. This need not indicate that the visual system is suboptimal but that its priors about which cue is more useful are not flat. This may be because, although strong changes in chromaticity typically represent object boundaries, changes in luminance can be caused by either a boundary or a shadow.

Journal Article Type Article
Acceptance Date Jul 6, 2015
Publication Date Dec 28, 2015
Deposit Date Sep 13, 2017
Publicly Available Date Aug 15, 2019
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 6
Issue 6
DOI https://doi.org/10.1177/2041669515621215
Public URL https://nottingham-repository.worktribe.com/output/1116170
Publisher URL https://journals.sagepub.com/doi/full/10.1177/2041669515621215
PMID 00036747

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