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.
复制标题
人类步进斜坡追踪和瞬态偏航旋转期间扭转速度的眼睛位置依赖性。
DOI：
10.1007/s00221-005-0261-1
复制
发表时间：
2006
影响因子：
2
通讯作者：
Walker,MarkF
中科院分区：
文献类型：
--
作者：
Tian,Jing;Zee,DavidS;Walker,MarkF
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°/s) and brief chair rotation (~200°/s2accelerated to 40°/s) at three different vertical positions (center 0°, up or down 15°). 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.
