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Department of Pediatrics, University Hospital and Veterans Administration Medical Center, Case Western Reserve University, Cleveland, OH (Dr. Weiss man and Mr. DiScenna)
Department of Neurology, University Hospital and Veterans Administration Medical Center, Case Western Reserve University, Cleveland, OH (Drs. Weiss man and Leigh, and Mr. DiScenna)
Department of Otolaryngology, University Hospital and Veterans Administration Medical Center, Case Western Reserve University, Cleveland, OH (Dr. Leigh)
Department of Biomedical Engineering, University Hospital and Veterans Administration Medical Center, Case Western Reserve University, Cleveland, OH (Dr. Leigh).
We measured the dynamic properties of the vestibulo-ocular reflex (VOR) in 20 healthy, newborn babies, using sinusoidal and velocity-step rotational stimuli. With sinusoidal stimuli, quick phases of nvstanmus were uncommon and the6 was a large phase lead of eye position over head position that exceeded 20" at frequencies below 0.5 Hz. With velocity-step stimuli, primary nystagmus lasted for a mean duration of 10 seconds and was followed by an early reversal phase of nystagmus. By 2 months of age, primary nystagmus induced by velocity-step stimuli was more prolonged (mean duration, 15 seconds) and the reversal phase occurred later. We postulate that these changes reflect maturation of visual pathways essential in calibrating the VOR so that vision remains clear during head perturbations.
Address correspondence and reprint requests to Dr. Leigh, Department of Neurology. University Hospitals of Cleveland, 2074 Abington Road, Cleveland, OH 44106.
Supported in part by PHS grant EY06717 and NASA contract 9-17439 (to Dr. Leigh), the Research Fund of December 1942 (to Dr. Weiss man), the Veterans Administration, and the Evener Arming ton Fund.
Received June 28, 1988. Accepted for publication in final form October 24, 1988.
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