ParkinsonCanadaV1, Main, Exploration, bibRecord, 002C89

Visual inspection time in Parkinson's disease: deficits in early stages of cognitive processing

Identifieur interne : 002C89 ( Main/Exploration ); précédent : 002C88; suivant : 002C90

Visual inspection time in Parkinson's disease: deficits in early stages of cognitive processing

Auteurs : Andrew M. Johnson [Canada] ; Quincy J. Almeida [Canada] ; Con Stough [Australie] ; James C. Thompson [Australie] ; Rene Singarayer [Canada] ; Mandar S. Jog [Canada]

Source :

Neuropsychologia [ 0028-3932 ] ; 2004.

RBID : Pascal:04-0164588

Descripteurs français

Pascal (Inist)
- Parkinson maladie, Vitesse, Traitement information, Perception, Vision, Trouble cognition, Adulte, Personne âgée, Temps inspection.
Wicri :
- topic : Adulte, Personne âgée.

English descriptors

KwdEn :
- Adult, Aged, Aged, 80 and over, Cognition (physiology), Cognition Disorders (etiology), Cognitive disorder, Elderly, Female, Humans, Information processing, Intelligence Tests, Male, Mental Status Schedule, Middle Aged, Neuropsychological Tests, Parkinson Disease (complications), Parkinson disease, Perception, Psychomotor Performance (physiology), Time Perception (physiology), Velocity, Vision, Visual Perception (physiology).
MESH :
- complications : Parkinson Disease.
- etiology : Cognition Disorders.
- physiology : Cognition, Psychomotor Performance, Time Perception, Visual Perception.
- Adult, Aged, Aged, 80 and over, Female, Humans, Intelligence Tests, Male, Mental Status Schedule, Middle Aged, Neuropsychological Tests.

Abstract

Inspection time (IT) is a simple information processing paradigm dependent on a participant's ability to identify physical properties of a stimulus presented for a specified time interval. In contrast with reaction time (RT) studies, the dependent variable of interest in IT is not related to the motoric speed with which the individual is able to respond, but rather the minimum presentation time necessary for participants to reliably identify physical properties of the stimulus. It is well documented that individuals with Parkinson's disease (PD) experience significant impairment on tests of simple RT, but it is unclear whether such deficits can be interpreted as 'pure' slowness of information processing, or a delay in the selection and output of a motor response. In the first experiment described here, a sample of 'optimally medicated' PD patients was compared with an age-matched control group, on an IT task. Results of this experiment suggested that individuals with PD required significantly longer stimulus presentation times than healthy participants. The second experiment compared a sample of PD patients (tested both "ON" and "OFF" their typical dopaminergic medications), with an age-matched control group, on the same test of IT. Results again indicated a significant IT deficit in participants with PD, and suggested that these deficits do not significantly resolve with levodopa treatment. Overall, the results of these two experiments suggest that information processing deficits associated with PD are distinct from motor impairment. These findings are further discussed in terms of existing neurochemical models of information processing ability.

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">Inspection time (IT) is a simple information processing paradigm dependent on a participant's ability to identify physical properties of a stimulus presented for a specified time interval. In contrast with reaction time (RT) studies, the dependent variable of interest in IT is not related to the motoric speed with which the individual is able to respond, but rather the minimum presentation time necessary for participants to reliably identify physical properties of the stimulus. It is well documented that individuals with Parkinson's disease (PD) experience significant impairment on tests of simple RT, but it is unclear whether such deficits can be interpreted as 'pure' slowness of information processing, or a delay in the selection and output of a motor response. In the first experiment described here, a sample of 'optimally medicated' PD patients was compared with an age-matched control group, on an IT task. Results of this experiment suggested that individuals with PD required significantly longer stimulus presentation times than healthy participants. The second experiment compared a sample of PD patients (tested both "ON" and "OFF" their typical dopaminergic medications), with an age-matched control group, on the same test of IT. Results again indicated a significant IT deficit in participants with PD, and suggested that these deficits do not significantly resolve with levodopa treatment. Overall, the results of these two experiments suggest that information processing deficits associated with PD are distinct from motor impairment. These findings are further discussed in terms of existing neurochemical models of information processing ability.</div>
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La maladie de Parkinson au Canada (serveur d'exploration)

Visual inspection time in Parkinson's disease: deficits in early stages of cognitive processing

Visual inspection time in Parkinson's disease: deficits in early stages of cognitive processing

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

	La maladie de Parkinson au Canada (serveur d'exploration)
	Attention, ce site est en cours de développement ! Attention, site généré par des moyens informatiques à partir de corpus bruts. Les informations ne sont donc pas validées.