Nonlinearities in the binocular combination of luminance and contrast.
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 binoc...
| Publicado en: | Vision Research Vol. 56; pp. 1 - 10 |
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| Autores principales: | , , , |
| Formato: | research Journal Article |
| Publicado: |
Pergamon Press - An Imprint of Elsevier Science
Mar2012
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104492144&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104492144 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00426989 2FL jtl: Vision Research issn: 00426989 maglogo: N pubinfo: dt: Mar2012 vid: 56 pid: 2410 pub: Pergamon Press - An Imprint of Elsevier Science artinfo: ui: 104492144 NLM22289645 2011641328 10.1016/j.visres.2012.01.008 NLM22289645 104492144 ppf: 1 ppct: 9 formats: tig: atl: Nonlinearities in the binocular combination of luminance and contrast. aug: au: Baker, Daniel H Wallis, Stuart A Georgeson, Mark A Meese, Tim S affil: School of Life & Health Sciences, Aston University, Birmingham, UK. d.h.baker1@aston.ac.uk sug: subj: Visual Acuity Physiology Lighting Vision Physiology Ocular Physiology Physiology Computer Terminals Models, Biological Physical Stimulation Methods Visual Perception Physiology ab: 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. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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