The horizontal vestibulo-ocular reflex gain during active and passive high-frequency head movements. 1994

B Hoshowsky, and D Tomlinson, and J Nedzelski
Department of Otolaryngology, Sunnybrook Health Science Centre, Toronto, Ontario, Canada.

Patients with bilateral peripheral vestibular loss complain of varying degrees of oscillopsia and balance difficulties. Some are able to engage in sporting activities while others are completely disabled. An assumption that other inputs are available to the vestibulo-ocular reflex (VOR) enabling it to achieve some degree of visual stability during high-frequency head movement is reasonable. In this study, the gain of the horizontal vestibulo-ocular reflex in 10 healthy subjects was examined during active high-frequency head-on-body rotation (head free), and compared to high-frequency passive whole-body rotation (head fixed). A statistical difference in the gain (P < .002) was noted for all frequencies between the two groups. In those individuals undergoing passive whole-body high-frequency movements, the gain was observed to rise (above unity) with increasing frequency of rotation, while the gain during active head-on-body rotation remained close to 1.

UI MeSH Term Description Entries
D008297 Male Males
D012027 Reflex, Vestibulo-Ocular A reflex wherein impulses are conveyed from the cupulas of the SEMICIRCULAR CANALS and from the OTOLITHIC MEMBRANE of the SACCULE AND UTRICLE via the VESTIBULAR NUCLEI of the BRAIN STEM and the median longitudinal fasciculus to the OCULOMOTOR NERVE nuclei. It functions to maintain a stable retinal image during head rotation by generating appropriate compensatory EYE MOVEMENTS. Vestibulo-Ocular Reflex,Reflex, Vestibuloocular,Reflexes, Vestibo-Ocular,Reflexes, Vestibuloocular,Reflex, Vestibulo Ocular,Reflexes, Vestibo Ocular,Vestibo-Ocular Reflexes,Vestibulo Ocular Reflex,Vestibuloocular Reflex,Vestibuloocular Reflexes
D004585 Electrooculography Recording of the average amplitude of the resting potential arising between the cornea and the retina in light and dark adaptation as the eyes turn a standard distance to the right and the left. The increase in potential with light adaptation is used to evaluate the condition of the retinal pigment epithelium. EOG,Electrooculograms,Electrooculogram
D005133 Eye Movements Voluntary or reflex-controlled movements of the eye. Eye Movement,Movement, Eye,Movements, Eye
D005260 Female Females
D006257 Head The upper part of the human body, or the front or upper part of the body of an animal, typically separated from the rest of the body by a neck, and containing the brain, mouth, and sense organs. Heads
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D012399 Rotation Motion of an object in which either one or more points on a line are fixed. It is also the motion of a particle about a fixed point. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Clinorotation,Clinorotations,Rotations

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