Recognition of category-related visual stimuli in Parkinson's disease: before and after pharmacological treatment.

Recognition of category-related visual stimuli in Parkinson's disease: before and after pharmacological treatment. Research Abstract Details 

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Recognition of category-related visual stimuli in Parkinson's disease: before and after pharmacological treatment. Abstract Text:

S Righi,M P Viggiano,M Paganini,S Ramat,P Marini,S Righi,M P Viggiano,M Paganini,S Ramat,P Marini,

Visual-sensory dysfunctions and semantic processing impairments are widely reported in Parkinson's disease (PD) research. The present study investigated the category-specific deficit in object recognition as a function of both the semantic category and spatial frequency content of stimuli. In the first experiment, the role of dopamine in object-recognition processing was assessed by comparing PD drug naïve (PD-DN), PD receiving levodopa treatment (PD-LD), and control subjects. Experiment 2 consisted of a retest session for PD drug naïve subjects after a period of pharmacological treatment. All participants completed an identification task which displayed animals and tools at nine levels of filtering. Each object was revealed in a sequence of frames whereby the object was presented at increasingly less-filtered images up to a complete version of the image. Results indicate an impaired identification pattern for PD-DN subjects solely for animal category stimuli. This differential pharmacological therapy effect was also confirmed at retest (experiment 2). Thus, our data suggest that dopaminergic loss has a specific role in category-specific impairment. Two possible hypotheses are discussed that may account for the defective recognition of semantically different objects in PD.

Recognition of category-related visual stimuli in Parkinson's disease: before and after pharmacological treatment. Publishing Authors By Initials

S Righi,MP Viggiano,M Paganini,S Ramat,P Marini,S Righi,MP Viggiano,M Paganini,S Ramat,P Marini,

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Recognition of category-related visual stimuli in Parkinson's disease: before and after pharmacological treatment. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Neuropsychologia

VOLUME: 45

Page Numbers: 2931-41

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ISSN: 0028-3932

DAY: 16

MONTH: 06

YEAR: 2007

Recognition of category-related visual stimuli in Parkinson's disease: before and after pharmacological treatment. Information

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LANGUAGE: eng

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AFFILIATION: Dipartimento di Psicologia, Università degli Studi di Firenze, Via s. Niccolò 93, 50125 Firenze, Italy. srighi@unifi.it

Country: England

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MEDLINETA: Neuropsychologia

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