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dc.contributor.supervisor Marotta, Jonathan (Psychology - Brain and Cognitive Sciences) en_US
dc.contributor.author Locheed, Keri
dc.date.accessioned 2012-03-21T14:21:45Z
dc.date.available 2012-03-21T14:21:45Z
dc.date.issued 2012-03-21
dc.identifier.uri http://hdl.handle.net/1993/5200
dc.description.abstract When viewing a face, healthy individuals tend to fixate on upper regions, particularly the eyes, which provide important configural information about the spatial layout of the face. In contrast, individuals with face blindness (prosopagnosia) rely more on local features – particularly the mouth. Presented here is an examination of face perception deficits in individuals with Posterior Cortical Atrophy (PCA). PCA is a rare progressive neurodegenerative disorder that is characterized by atrophy in occipito-parietal and occipito-temporal areas. PCA primarily affects higher visual processing, while memory, reasoning, and insight remain relatively intact. Common among individuals with PCA is simultanagnosia, an inability to perceive more than one object or detail simultaneously. One might consider simultanagnosia the most extreme form of a feature-based approach. In a series of investigations, individuals with PCA and their healthy control participants completed a same/different discrimination task in which images of faces were presented as cue-target pairs. Eye-tracking equipment (Experiment 1) and the newly developed Viewing window paradigm (Experiment 2) were used to investigate scanning patterns when faces were presented in full view, and through a restricted viewing aperture, respectively. In contrast to previous prosopagnosia research, individuals with PCA each produced unique scan paths that focused on one aspect of the face. Individuals with PCA tended to focus on areas of high-contrast but many of these areas were not diagnostically useful, suggesting that they were having difficulty processing the face even at a featural level. These results suggest a role of simultanagnosia in the scan patterns of PCA patients that is not reflective of ‘typical’ prosopagnosia, and instead points to simultanagnosia, sometimes matched with basic perceptual impairments, as a significant contributor to the face perception deficits seen in PCA. en_US
dc.rights info:eu-repo/semantics/openAccess
dc.subject posterior cortical atrophy en_US
dc.subject simultanagnosia en_US
dc.subject face perception en_US
dc.title Posterior Cortical Atrophy: The role of simultanagnosia in deficits of face perception en_US
dc.type info:eu-repo/semantics/masterThesis
dc.degree.discipline Psychology en_US
dc.contributor.examiningcommittee Jakobson, Lorna (Psychology - Brain and Cognitive Sciences), Kilgour, Andrea (Faculty of Medicine - Clinical Health Psychology) en_US
dc.degree.level Master of Arts (M.A.) en_US
dc.description.note May 2012 en_US


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