Eye-position dependence of torsional velocity during step-ramp pursuit and transient yaw rotation in humans.

Eye-position dependence of torsional velocity during step-ramp pursuit and transient yaw rotation in humans. Research Abstract Details 

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Eye-position dependence of torsional velocity during step-ramp pursuit and transient yaw rotation in humans. Abstract Text:

Jing Tian,David S Zee,Mark F Walker,

The time course of eye-position-dependent torsion during transient horizontal pursuit and yaw rotation was examined in seven normal human subjects. The stimuli consisted of step-ramp target motion (25, 40 degrees /s) and brief chair rotation (approximately 200 degrees /s(2) accelerated to 40 degrees /s) at three different vertical positions (center 0 degrees , up or down 15 degrees ). Three-dimensional eye movements were recorded with dual search coils. The kinematics of pursuit and the rotational vestibulo-ocular reflex (rVOR) were assessed by determining the tilt-angle slope, a measure of the variation of the axis of eye-velocity with vertical eye position. We found that the tilt-angle slope during pursuit was initially 0.4+/-0.07 (mean+/-95% confidence interval) and then gradually rose to 0.64+/-0.04, at about the time that the steady-state eye-velocity was reached. The rVOR began with a nearly head-fixed axis (0.08+/-0.04), appropriate for full retinal image stabilization, followed by a gradual increase of the tilt-angle slope to 0.31+/-0.02. Thus, differences between pursuit and the rVOR with respect to Listing's law can be seen from the onset of transient responses, although in both cases eye-position-dependent torsion increases with time. This temporal evolution of the axis of eye-velocity may involve the velocity-storage mechanism.

Eye-position dependence of torsional velocity during step-ramp pursuit and transient yaw rotation in humans. Publishing Authors By Initials

J Tian,DS Zee,MF Walker,

For similar pathological conditions, signs and symptoms: pathological conditions, anatomical: torsion abnormality research abstracts see: pathological conditions, signs and symptoms: pathological conditions, anatomical: torsion abnormality research

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Eye-position dependence of torsional velocity during step-ramp pursuit and transient yaw rotation in humans. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 171

Page Numbers: 225-30

Journal Abbreviation:

ISSN: 0014-4819

DAY: 24

MONTH: 11

YEAR: 2005

Eye-position dependence of torsional velocity during step-ramp pursuit and transient yaw rotation in humans. Information

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LANGUAGE: eng

NlmUniqueID: 43312

Eye-position dependence of torsional velocity during step-ramp pursuit and transient yaw rotation in humans. Keywords Mesh Terms:

KEYWORDS: Torsion Abnormality

MESH TERMS: physiopathology

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Grant and Affiliation Information for Eye-position dependence of torsional velocity during step-ramp pursuit and transient yaw rotation in humans.

AFFILIATION: Department of Neurology, The Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Pathology 2-210, Baltimore, MD, 21287, USA.

Country: Germany

AGENCY: United States NEI

GRANT: K23-EY00400

ACRONYM: EY

MEDLINETA: Exp Brain Res

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