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    Perceptual Mnemonic Medial Temporal Lobe Function in Individuals with Down Syndrome

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    Author
    Spanò, Goffredina
    Issue Date
    2012
    Keywords
    perirhinal cortex
    prefrontal cortex
    visual perception
    Psychology
    Down syndrome
    object recognition
    Advisor
    Edgin, Jamie Ogline
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Behavioral data in individuals with Down syndrome (DS) and mouse models of the syndrome suggest impaired object processing. In this study we examined the component processes that may contribute to object memory deficits. A neuropsychological test battery was administered to individuals with DS (n=28), including tests targeting perirhinal cortex (PRC) and prefrontal cortex (PFC) function, tests of perception (i.e., convexity based figure ground perception), and tests of memory (object recognition and object-in-place learning). To compare to individuals with DS, the same number of typically developing chronological age (CA, n=28) and mental age-matched (MA, n=28) controls were recruited. We observed object memory deficits in DS (p<0.001). In contrast, the DS group showed relatively intact use of convexity when making figure-ground judgments and spared PRC-dependent function, as compared to MA control. In addition, measures of PFC function seemed to be related to performance on object recognition tasks. These findings suggest that the inputs into the MTL from low and high level perceptual processing streams may be intact in DS. The object memory deficits we observed might reflect impaired PFC function.
    Type
    text
    Electronic Thesis
    Degree Name
    M.A.
    Degree Level
    masters
    Degree Program
    Graduate College
    Psychology
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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