Vestibulo-ocular reflex (VOR) biases in normal subjects and patients with compensated vestibular loss.

Abstract:

:The properties of the vestibulo-ocular reflex (VOR) were examined during sinusoidal passive head rotation in the dark at 1/6 Hz, in 9 normal subjects and 14 unilateral vestibular patients. Rotation speeds ranged from 90 to 180 degrees/s. The bias (offset of slow-phase velocity from zero) and gain in the VOR were estimated by using a polynomial (cubic) fit between head and slow-phase eye velocity, thereby allowing for possible non-linearities in the reflex. The gain in the VOR in this context refers to the linear components of the fit, and so predicts sensitivity only at low head velocities. The aim of the study was to verify previous theoretical predictions that VOR bias could vary with the rotation parameters, that this bias could be used to detect the side of a vestibular lesion even at low frequency rotation, and make non-linearities more obvious. Confirming these predictions, the VOR bias in a given test is never equal to any spontaneous nystagmus, even if present before rotation. The range of values for the gain in the VOR (as defined above) in normals and compensated unilateral vestibular patients overlap, so that they cannot be statistically separated into two response sets.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Acta Otolaryngol

journal_title

Acta oto-laryngologica

authors

Katsarkas A,Galiana HL,Smith HL

doi

10.3109/00016489509139351

subject

Has Abstract

pub_date

1995-07-01 00:00:00

pages

476-83

issue

4

eissn

0001-6489

issn

1651-2251

journal_volume

115

pub_type

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