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• W2169671007 abstract "<h3>OBJECTIVES</h3> Patients with Parkinson’s disease characteristically have difficulty in sustaining repetitive motor actions. The purpose of this study was to establish if parkinsonian difficulty with sustaining repetitive limb movements also applies to smooth ocular pursuit and to identify any pursuit abnormalities characteristic of Parkinson’s disease. <h3>METHODS</h3> Ocular pursuit in seven patients with moderate to severe bradykinesia predominant Parkinson’s disease was compared with seven age matched controls. Predictive and non-predictive pursuit of constant velocity target ramps were examined. Subjects pursued intermittently illuminated 40⁰/s ramps sweeping to the left or right with an exposure duration of 480 ms and average interval of 1.728 s between presentations. To examine for any temporal changes in peak eye velocity, eye displacement or anticipatory smooth pursuit the 124 s duration of each record was divided into four epochs (E1, E2, E3, E4), each lasting 31 s and containing 18 ramp stimuli. Three test conditions were examined in each subject: predictive (PRD1), non-predictive (NPD), and predictive (PRD2) in that order. <h3>RESULTS</h3> Both patients and controls initiated appropriate anticipatory pursuit before target onset in the PRD1 and PRD2 conditions that enhanced the response compared with the NPD condition. The distinctive findings in patients with Parkinson’s disease were a reduction in response magnitude compared with controls and a progressive decline of response with stimulus repetition. The deficits were explained on the basis of easy fatiguability in Parkinson’s disease. <h3>CONCLUSIONS</h3> Ocular pursuit shows distinct anticipatory movements in Parkinson’s disease but peak velocity and displacement are reduced and progressively decline with repetition as found with limb movements." @default.
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• W2169671007 date "1999-06-01" @default.
• W2169671007 modified "2023-09-29" @default.
• W2169671007 title "Progressive bradykinesia and hypokinesia of ocular pursuit in Parkinson's disease" @default.
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• W2169671007 doi "https://doi.org/10.1136/jnnp.66.6.746" @default.
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