The integrated optokinetic nystagmus inter-saccadic interval scales statistical different in a group of vertigo patients depended on the stimulation velocity, but not for healthy subjects
Norwegian National Advisory Unit on Vestibular Disorders, Haukeland University Hospital, Bergen, Norway.
Research Article
World Journal of Advanced Research and Reviews, 2022, 16(01), 071–077
Article DOI: 10.30574/wjarr.2022.16.1.0988
Publication history:
Received on 22 August 2022; revised on 30 September 2022; accepted on 03 October 2022
Abstract:
Optokinetic nystagmus is rhythmic eye movements, back and forth, with a slow and fast phase, when the eyes are presented for full-field visual stimulus. OKN was recorded in 10 healthy subjects and 10 patients suffering from vertigo, for four conditions: stripes moving 30 o/s left and right and 60 o/s left and right.
The aim of the present study was to analyze if the optokinetic stimulation intensity, stripes moving with angular velocity of 30 and 60 o/s, below and above the normal threshold for smooth pursuit function, influences the scaling properties of the integrated optokinetic nystagmus inter-saccadic intervals in a group of patients suffering from vertigo and a group of healthy subjects.
Calculating the scaling, the spread over time, for the integrated optokinetic nystagmus inter-saccadic intervals, the time intervals between the onsets of consecutive fast components, shows lower Hurst exponent for velocity stimulation of 30o/s compared to 60o/s for both patients and health subjects, but only reach statistical significance for the group of patients. This result is a novel finding.
Keywords:
Nystagmus; Vestibular; Vertigo; Hurst exponent; Dizziness
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