The effect of orientation-related prior probability information on contrast perception

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buir.advisorBoyacı, Hüseyin
dc.contributor.authorNazlı, İlayda
dc.date.accessioned2019-08-02T13:16:08Z
dc.date.available2019-08-02T13:16:08Z
dc.date.copyright2019-07
dc.date.issued2019-07
dc.date.submitted2019-07-26
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (M.S.): Bilkent University, Department of Psychology, İhsan Doğramacı Bilkent University, 2019.en_US
dc.descriptionIncludes bibliographical references (leaves 57-60).en_US
dc.description.abstractIt is known that visual perception is the product of sensory input and prior probability information. Previous studies support well that expectation influence recognition and decision-making; however, we have limited knowledge about how expectation influences low level visual processing. In the current study, we examine the effect of expectation on early visual processing. That is, we provide task-irrelevant expectation cue related to the orientation of target Gabor grating, and we ask participants to indicate the spatial location of target grating while systematically manipulating its contrast level. In addition, we examine how different expectation validities (i.e. 75%, 50%, 100%) and neutral expectation cue affect visual perception. In Experiment 1, where the orientation of expectation cue and target gratings are vertical or horizontal, contrast threshold is lower in congruent trials at 75% validity condition. In Experiment 2, where the orientation of cue grating implies specific range (i.e. ±15 around 0 or 90), contrast threshold is lower in congruent trials at 75% and 50% validity condition. In Experiment 3B, where the orientation of expectation cue and target Gabor grating are within wider range (i.e. ±30 around 0 or 90), contrast threshold is lower in congruent trials at 75% validity condition. In Experiment 3A, where the orientation of expectation cue and target Gabor grating are within a specific range (i.e. ±15 around 0 or 90) contrast threshold is lower in congruent trials at 75% and 50% validity condition. In Experiment 3B, where the orientation of expectation cue and target Gabor grating are within wider range (i.e. ±30 around 0 or 90), contrast threshold is lower in congruent trials at 75% validity condition.en_US
dc.description.provenanceSubmitted by Betül Özen (ozen@bilkent.edu.tr) on 2019-08-02T13:16:08Z No. of bitstreams: 1 MAthesis_İlaydaNazli.pdf: 23249249 bytes, checksum: b4ab6b23f817ec5d9944a50b966df02a (MD5)en
dc.description.provenanceMade available in DSpace on 2019-08-02T13:16:08Z (GMT). No. of bitstreams: 1 MAthesis_İlaydaNazli.pdf: 23249249 bytes, checksum: b4ab6b23f817ec5d9944a50b966df02a (MD5) Previous issue date: 2019-07en
dc.description.statementofresponsibilityby İlayda Nazlıen_US
dc.format.extentxv, 88 leaves : charts ; 30 cm.en_US
dc.identifier.itemidB124540
dc.identifier.urihttp://hdl.handle.net/11693/52295
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectExpectationen_US
dc.subjectContrasten_US
dc.subjectPrior probability informationen_US
dc.subjectVisual perceptionen_US
dc.titleThe effect of orientation-related prior probability information on contrast perceptionen_US
dc.title.alternativeOryantasyona yönelik ön olasılık bilgisinin kontrast algısı üzerindeki etkisien_US
dc.typeThesisen_US
thesis.degree.disciplinePsychology
thesis.degree.grantorBilkent University
thesis.degree.levelMaster's
thesis.degree.nameMA (Master of Arts)

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