Perception of Lighting and Reflectance in Real and Synthetic Stimuli

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dc.contributor.advisorMurray, Richard F.
dc.creatorPatel, Khushbu Yogeshbhai
dc.date.accessioned2019-03-05T14:45:28Z
dc.date.available2019-03-05T14:45:28Z
dc.date.copyright2018-09-18
dc.date.issued2019-03-05
dc.date.updated2019-03-05T14:45:28Z
dc.degree.disciplinePsychology (Functional Area: Brain, Behaviour & Cognitive Sciences)
dc.degree.levelMaster's
dc.degree.nameMA - Master of Arts
dc.description.abstractThe human visual system estimates the proportion of light reflected off of a surface despite variable lighting in a scene, a phenomenon known as lightness constancy. Classically, lightness constancy has been explained as a 'discounting' of the lighting intensity (Helmholtz, 1866), and this continues to be a common view today (e.g., Brainard & Maloney, 2011). However, Logvinenko and Maloney (2006) have made a radically different claim that the human visual system does not have any perceptual access to an estimation of lightness. The experiments described in Chapter 2 use a novel experimental paradigm to test this new theory proposed by Logvinenko and Maloney. We provide evidence against Logvinenko and Maloney's theory of lightness perception while adding to existing evidence that the visual system has good lightness constancy. In Chapter 3, we manipulate screen colour and texture cues to test the realism of computer-generated stimuli. We find that by matching the chromaticity of an LCD screen to the surrounding lighting and using a realistic texture, LCD screens can be made to appear similar to physical paper. Finally, Chapter 4 is an extension of the ideas from Chapter 3, in which the knowledge about how to adjust color and texture cues on an LCD monitor is applied to a lightness matching task. Here, the LCD screen is a small part of a larger physical setup. Additionally, levels of lightness constancy are compared across physical and simulated surfaces in the same novel experimental paradigm in Chapters 2 and 4. We find that physical and simulated surfaced elicit different levels of lightness constancy on the same task.
dc.identifier.urihttp://hdl.handle.net/10315/35824
dc.language.isoen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectExperimental psychology
dc.subject.keywordsPsychophysics
dc.subject.keywordsLighting
dc.subject.keywordsReflectance
dc.subject.keywordsIllumination
dc.subject.keywordsDissimilarity model
dc.subject.keywordsBrightness
dc.subject.keywordsLow-level vision
dc.subject.keywordsVision
dc.subject.keywordsComputer realism
dc.subject.keywordsLCD screens
dc.subject.keywordsEmissive surfaces
dc.subject.keywordsReflective surfaces
dc.subject.keywordsReal versus computers
dc.subject.keywordsLightness constancy
dc.subject.keywordsAlternative forced choice task
dc.subject.keywordsAsymmetric lightness matching
dc.subject.keywordsColor cues
dc.subject.keywordsTexture cues
dc.subject.keywordsDiscounting
dc.subject.keywordsPerceptual dimensions
dc.subject.keywordsLightness perception
dc.titlePerception of Lighting and Reflectance in Real and Synthetic Stimuli
dc.typeElectronic Thesis or Dissertation

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