Vestibulo-Ocular Reflex Gain in Man during Active versus Passive Oscillation and the Influence of Voluntary Gaze-Control Tasks.
Abstract
This report compares passive and active oscillation and also examines effects of instruction sets on the vestibulo-oular reflex in order to establish procedural guidelines for simple procedures for testing visual and vestibular interaction in operational settings. Manual oscillation was feasible for generating passive whole-body oscillations up to 1.0 Hz. Below 1.0 Hz, VOR gain was virtually zero when subjects tracked a head-fixed target and -1.0 when they tracked an earth-fixed target. Below 1.0 Hz in darkness, VOR gain was intermediate between these two values, but it was markedly influenced by instructions: when subjects were instructed to track an imagined earth-fixed target, the gain was significantly higher than it was when they were instructed to track an imagined head-fixed target. At oscillation frequencies above 1.0 Hz, VOR gain converged at approximately -0.90, regardless of instructions or stimulus conditions. VOR gain was the same whether oscillation was active or passive, except under the condition imagined head-fixed target in darkness, where active oscillation yielded higher gains than passive oscillation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 13, 1982
- Accession Number
- ADA132006
Entities
People
- C. W. Stockwell
- F. E. Guedry Jr.
- G. T. Turnipseed
- Ralph M. Jell
Organizations
- Naval Aerospace Medical Research Laboratory