Neurology Medical News about Parkinsons disease;vertical optokinetic nystagmus

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Vertical optokinetic nystagmus in Parkinson's disease
Movement Disorders, 06/16/09

Knapp CM et al. – Asymmetry in vertical optokinetic nystagmus (OKN) associated with Parkinson's disease (PD) vs controls may result from an abnormal pursuit/early OKN system in PD leading to greater influence of the delayed OKN system.

Methods

Recording of eye movements in 14 PD pts and 14 age-matched controls in response to large field OKN stimulation using stimulus velocities of 20°/second and 40°/second
Comparison of asymmetry of horizontal and vertical responses in the 2 groups

Results

Vertical OKN was strongly asymmetric in PD with reduced gains for downward-moving stimuli
Asymmetry was significantly greater than that recorded in control volunteers

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