Increased visual dependence in Parkinson's disease.
Identifieur interne : 001077 ( PubMed/Checkpoint ); précédent : 001076; suivant : 001078Increased visual dependence in Parkinson's disease.
Auteurs : Jean Philippe Azulay [France] ; Serge Mesure ; Bernard Amblard ; Jean PougetSource :
- Perceptual and motor skills [ 0031-5125 ] ; 2002.
English descriptors
- KwdEn :
- MESH :
- complications : Parkinson Disease.
- diagnosis : Perceptual Disorders.
- etiology : Perceptual Disorders.
- physiology : Locomotion, Visual Fields, Visual Perception.
- Aged, Female, Gait, Humans, Male, Random Allocation, Severity of Illness Index.
Abstract
The present study tested the hypothesis that there is increased visual dependence perceptually in patients with Parkinson's disease. We also evaluated whether the visual control of posture and locomotion was related to perceptual visual field dependence. 21 patients with idiopathic Parkinson's disease and 22 age-matched normal subjects were compared on judgment of the visual vertical using the Rod-and-Frame test with visual perturbations in the frontal plane with a tilted frame. Patients had significantly larger errors than controls in the estimation of the subjective vertical. In the same experiment, we performed a posture and a gait analysis in both groups. Posturographic evaluation did not indicate significant differences in unsteadiness between patients and controls. Gait analysis indicated a typical pattern of reduced velocity, shortened stride length, and normal step width. A significant correlation of .89 was found only in the Parkinsonian group between their errors in estimating subjective visual vertical and the Romberg quotient evaluating visual contribution to postural control. No specific locomotor pattern was correlated with visual dependence. Considering our results and previous reports on the visual control of posture, we conclude that patients with Parkinson's disease showed a significantly increased dependence upon visual information both perceptually and motorically, with an increased perceptual visual dependence in the patients being predictive of an equivalent visual dependence or visual control of posture and equilibrium.
DOI: 10.2466/pms.2002.95.3f.1106
PubMed: 12578250
Affiliations:
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pubmed:12578250Le document en format XML
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<front><div type="abstract" xml:lang="en">The present study tested the hypothesis that there is increased visual dependence perceptually in patients with Parkinson's disease. We also evaluated whether the visual control of posture and locomotion was related to perceptual visual field dependence. 21 patients with idiopathic Parkinson's disease and 22 age-matched normal subjects were compared on judgment of the visual vertical using the Rod-and-Frame test with visual perturbations in the frontal plane with a tilted frame. Patients had significantly larger errors than controls in the estimation of the subjective vertical. In the same experiment, we performed a posture and a gait analysis in both groups. Posturographic evaluation did not indicate significant differences in unsteadiness between patients and controls. Gait analysis indicated a typical pattern of reduced velocity, shortened stride length, and normal step width. A significant correlation of .89 was found only in the Parkinsonian group between their errors in estimating subjective visual vertical and the Romberg quotient evaluating visual contribution to postural control. No specific locomotor pattern was correlated with visual dependence. Considering our results and previous reports on the visual control of posture, we conclude that patients with Parkinson's disease showed a significantly increased dependence upon visual information both perceptually and motorically, with an increased perceptual visual dependence in the patients being predictive of an equivalent visual dependence or visual control of posture and equilibrium.</div>
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<Abstract><AbstractText>The present study tested the hypothesis that there is increased visual dependence perceptually in patients with Parkinson's disease. We also evaluated whether the visual control of posture and locomotion was related to perceptual visual field dependence. 21 patients with idiopathic Parkinson's disease and 22 age-matched normal subjects were compared on judgment of the visual vertical using the Rod-and-Frame test with visual perturbations in the frontal plane with a tilted frame. Patients had significantly larger errors than controls in the estimation of the subjective vertical. In the same experiment, we performed a posture and a gait analysis in both groups. Posturographic evaluation did not indicate significant differences in unsteadiness between patients and controls. Gait analysis indicated a typical pattern of reduced velocity, shortened stride length, and normal step width. A significant correlation of .89 was found only in the Parkinsonian group between their errors in estimating subjective visual vertical and the Romberg quotient evaluating visual contribution to postural control. No specific locomotor pattern was correlated with visual dependence. Considering our results and previous reports on the visual control of posture, we conclude that patients with Parkinson's disease showed a significantly increased dependence upon visual information both perceptually and motorically, with an increased perceptual visual dependence in the patients being predictive of an equivalent visual dependence or visual control of posture and equilibrium.</AbstractText>
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