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

2.50
Hdl Handle:
http://hdl.handle.net/10547/300048
Title:
Visual memory errors in Parkinson's Disease patient with visual hallucinations
Authors:
Barnes, Jim; Boubert, Laura
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
Issue Date:
2011
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
Appears in Collections:
Research Centre for Applied Psychology

Full metadata record

DC FieldValue Language
dc.contributor.authorBarnes, Jimen_GB
dc.contributor.authorBoubert, Lauraen_GB
dc.date.accessioned2013-08-28T14:03:54Z-
dc.date.available2013-08-28T14:03:54Z-
dc.date.issued2011-
dc.identifier.citationBarnes, J & Boubert, L. (2011) 'Visual memory errors in Parkinson's Disease patient with visual hallucinations', International Journal of Neuroscience, 121(3), pp.159-164.en_GB
dc.identifier.issn0020-7454-
dc.identifier.issn1543-5245-
dc.identifier.doi10.3109/00207454.2010.539308-
dc.identifier.urihttp://hdl.handle.net/10547/300048-
dc.description.abstractThe 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.en_GB
dc.language.isoenen
dc.publisherInforma Healthcareen_GB
dc.relation.urlhttp://informahealthcare.com/doi/abs/10.3109/00207454.2010.539308en_GB
dc.rightsArchived with thanks to International Journal of Neuroscienceen_GB
dc.titleVisual memory errors in Parkinson's Disease patient with visual hallucinationsen
dc.typeArticleen
dc.identifier.journalInternational Journal of Neuroscienceen_GB
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