Context-dependent lightness affects perceived contrast

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buir.contributor.authorPamir, Zahide
buir.contributor.authorBoyacı, Hüseyin
dc.citation.epage33en_US
dc.citation.spage24en_US
dc.citation.volumeNumber124en_US
dc.contributor.authorPamir, Zahideen_US
dc.contributor.authorBoyacı, Hüseyinen_US
dc.date.accessioned2018-04-12T10:52:21Z
dc.date.available2018-04-12T10:52:21Z
dc.date.issued2016en_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.departmentDepartment of Psychologyen_US
dc.departmentAysel Sabuncu Brain Research Center (BAM)en_US
dc.description.abstractPerceived contrast of a grating varies with its background (or mean) luminance: of the two gratings with the same photometric contrast the one on higher luminance background appears to have higher contrast. Does perceived contrast also vary with context-dependent background lightness even when the luminance remains constant? We investigated this question using a stimulus in which two equiluminant patches ("context squares", CSs) appear different in lightness. First we measured the lightness effect in a behavioral experiment. After ensuring that it was present for all participants, we conducted perceived contrast experiments, where participants judged the contrast of rectified incremental and decremental square-wave gratings superimposed on the CSs. For the incremental gratings participants' settings were significantly different for the two CSs. Specifically, perceived contrast was higher when the gratings were placed on the context square that was perceived lighter. In a follow-up experiment we measured perceived contrast of rectified gratings on isolated patches that differed in luminance. The pattern of results of the two experiments was consistent, demonstrating that possibly shared mechanisms underpin the effects of background luminance and context-dependent lightness on perceived contrast. © 2016 Elsevier Ltd.en_US
dc.identifier.doi10.1016/j.visres.2016.06.003en_US
dc.identifier.issn0042-6989
dc.identifier.urihttp://hdl.handle.net/11693/36759
dc.language.isoEnglishen_US
dc.publisherElsevier Ltden_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.visres.2016.06.003en_US
dc.source.titleVision Researchen_US
dc.subjectContrasten_US
dc.subjectLightnessen_US
dc.subjectLuminanceen_US
dc.subjectContexten_US
dc.titleContext-dependent lightness affects perceived contrasten_US
dc.typeArticleen_US
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Aysel Sabuncu Brain Research Center (BAM)
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