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    Visual memory errors in Parkinson's Disease patient with visual hallucinations

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    Authors
    Barnes, Jim
    Boubert, Laura
    Issue Date
    2011
    
    Metadata
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    Abstract
    The occurrences of visual hallucinations seem to be more prevalent in low light and hallucinators tend to be more prone to false positive type errors in memory tasks. Here we investigated whether the richness of stimuli does indeed affect recognition differently in hallucinating and nonhallucinating participants, and if so whether this difference extends to identifying spatial context. We compared 36 Parkinson's disease (PD) patients with visual hallucinations, 32 Parkinson's patients without hallucinations, and 36 age-matched controls, on a visual memory task where color and black and white pictures were presented at different locations. Participants had to recognize the pictures among distracters along with the location of the stimulus. Findings revealed clear differences in performance between the groups. Both PD groups had impaired recognition compared to the controls, but those with hallucinations were significantly more impaired on black and white than on color stimuli. In addition, the group with hallucinations was significantly impaired compared to the other two groups on spatial memory. We suggest that not only do PD patients have poorer recognition of pictorial stimuli than controls, those who present with visual hallucinations appear to be more heavily reliant on bottom up sensory input and impaired on spatial ability.
    Citation
    Barnes, J & Boubert, L. (2011) 'Visual memory errors in Parkinson's Disease patient with visual hallucinations', International Journal of Neuroscience, 121(3), pp.159-164.
    Publisher
    Informa Healthcare
    Journal
    International Journal of Neuroscience
    URI
    http://hdl.handle.net/10547/300048
    DOI
    10.3109/00207454.2010.539308
    Additional Links
    http://informahealthcare.com/doi/abs/10.3109/00207454.2010.539308
    Type
    Article
    Language
    en
    ISSN
    0020-7454
    1543-5245
    ae974a485f413a2113503eed53cd6c53
    10.3109/00207454.2010.539308
    Scopus Count
    Collections
    Research Centre for Applied Psychology

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