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人类抑制后前庭眼反射:视觉和非视觉机制

Post-suppression vestibulo-ocular reflex in man: visual and non-visual mechanisms.

作者信息

Segal B N

出版信息

Exp Brain Res. 1985;59(3):524-32. doi: 10.1007/BF00261343.

Abstract

The vestibulo-ocular reflex (VOR) was intermittently suppressed by fixating a head-fixed target (light on: 9 s; darkness: 2 s) during whole-body (60-100 deg/s peak; 0.01-0.17 Hz) sinusoidal and triangular oscillation about the vertical axis for about 2 min. Eye movements associated with intervals of darkness at different phases of body oscillation were stimulus-locked averaged, thereby estimating the "post-suppression VOR". The gain ( (eye velocity)/(head velocity) ) of the post-suppression VOR was generally 26-50% of the normal gain in maintained darkness. During sinusoidal body oscillation, the phase lead of the post-suppression VOR equalled or, at low frequencies, appeared to exceed the normal lead in maintained darkness. When the light was permanently extinguished after 2 min of intermittent suppression, an initially reduced VOR rapidly (e.g., 0.4 s) appeared and required 6-30 s to build up to normal again. These observations indicated that visual suppression of the VOR dissipated in darkness with rapid and slow components. During 0.17 Hz, 60 deg/s sinusoidal oscillation, the rapid (perhaps visual) component was responsible for 1/3, and the slow (perhaps non-visual) component for 2/3, of all suppressive effects.

摘要

在围绕垂直轴进行全身(峰值60 - 100度/秒;0.01 - 0.17赫兹)正弦和三角振荡约2分钟的过程中,通过注视头部固定的目标(光照:9秒;黑暗:2秒)间歇性地抑制前庭眼反射(VOR)。对身体振荡不同阶段黑暗间隔期间相关的眼动进行刺激锁定平均,从而估计“抑制后VOR”。抑制后VOR的增益((眼速度)/(头速度))通常为持续黑暗中正常增益的26 - 50%。在正弦身体振荡期间,抑制后VOR的相位超前等于或在低频时似乎超过持续黑暗中的正常超前。在间歇性抑制2分钟后灯光永久熄灭时,最初降低的VOR迅速出现(例如,0.4秒),并需要6 - 30秒才能再次恢复到正常水平。这些观察结果表明,VOR的视觉抑制在黑暗中以快速和缓慢成分消散。在0.17赫兹、60度/秒的正弦振荡期间,所有抑制作用中,快速(可能是视觉)成分占1/3,缓慢(可能是非视觉)成分占2/3。

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