| Nonlinearities in the binocular combination of luminance and contrast. | |
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MedLine Citation:
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PMID: 22289645 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We studied the rules by which visual responses to luminous targets are combined across the two eyes. Previous work has found very different forms of binocular combination for targets defined by increments and by decrements of luminance, with decrement data implying a severe nonlinearity before binocular combination. We ask whether this difference is due to the luminance of the target, the luminance of the background, or the sign of the luminance excursion. We estimated the pre-binocular nonlinearity (power exponent) by fitting a computational model to ocular equibrightness matches. The severity of the nonlinearity had a monotonic dependence on the signed difference between target and background luminance. For dual targets, in which there was both a luminance increment and a luminance decrement (e.g. contrast), perception was governed largely by the decrement. The asymmetry in the nonlinearities derived from the subjective matching data made a clear prediction for visual performance: there should be more binocular summation for detecting luminance increments than for detecting luminance decrements. This prediction was confirmed by the results of a subsequent experiment. We discuss the relation between these results and luminance nonlinearities such as a logarithmic transform, as well as the involvement of contemporary model architectures of binocular vision. |
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Authors:
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Daniel H Baker; Stuart A Wallis; Mark A Georgeson; Tim S Meese |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-1-24 |
Journal Detail:
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Title: Vision research Volume: - ISSN: 1878-5646 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-1-31 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0417402 Medline TA: Vision Res Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2012. Published by Elsevier Ltd. |
Affiliation:
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School of Life & Health Sciences, Aston University, Birmingham B4 7ET, UK. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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