VELOCITY STORAGE, NYSTAGMUS, AND VISUAL-VESTIBULAR INTERACTIONS IN HUMANS
VELOCITY STORAGE, NYSTAGMUS, AND VISUAL-VESTIBULAR INTERACTIONS IN HUMANS
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DOI：
10.1111/j.1749-6632.1981.tb30888.x
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发表时间：
1981-01-01
影响因子：
5.2
通讯作者：
DENNETT, D
中科院分区：
文献类型：
--
作者：
COHEN, B;HENN, V;DENNETT, D
方法对5名年龄从13岁到48岁的受试者进行了实验。用直流耦合眼电图仪记录眼球运动。该记录系统的上限为150赫兹。在每次试验前后都对眼球运动进行了校准。研究人员将眼睛的水平和垂直运动记录在纸上和FM磁带上，并记录了慢相速度和代表照明、工作台位置、OKN鼓速度和感觉到的旋转的信号。受试者通过移动固定在电位器轴上的手柄来估计旋转，电位器是桥接电路的一部分。手柄的每一次完整旋转代表了360‘的主观旋转。这在图中被称为“旋转感觉”。在实验期间，受试者坐在旋转平台上的椅子上。该平台位于一个旋转的视动鼓内，鼓上有7.5英寸的黑白交替条纹。滚筒和平台可以一起旋转，也可以由伺服电机单独旋转。平台的最大加速度为100/秒2。平台和滚筒可以机械连接，以在旋转期间提供固定视野。用黑暗中的平台速度阶跃来研究前庭震颤，在光中给出环绕速度阶跃来研究OKN和OKAN，并在地球静止的光照环境中旋转，研究视觉-前庭相互作用对旋转前后眼球震颤的影响。在每一次刺激后，在黑暗中记录后遗症眼球震颤。为了测试注视抑制眼球震颤的效果，受试者在旋转后眼球震颤或OKAN期间处于不同时间的静止环境中，并在他们回到黑暗中后测定眼球震颤的恢复速度。
METHODSExperiments were done on five individuals ranging in age from 13 to 48. Eye movements were recorded with electro-oculography (EOG) using dc coupling. The recording system had an upper bandpass of 150 Hz. Eye movements were calibrated before and after each trial. Horizontal and vertical eye movements were recorded on paper and on FM magnetic tape along with slow-phase velocity and signals representing illumination, table position, OKN drum velocity and perceived rotation. Subjects estimated rotation by moving a handle fixed to the shaft of a potentiometer that was part of a bridge circuit. Each complete revolution of the handle represented 360’of subjective rotation. This is designated in the figures as “rotation sensation.” During experiments, subjects sat in a chair on a rotating platform. The platform was situated inside a rotating optokinetic drum that had alternating 7.5” black and white stripes. The drum and platform could be rotated together or separately by servo-controlled motors. The maximum acceleration of the platform was 10O0/second2. The platform and drum could be coupled mechanically to provide a fixed visual field during rotation. Steps of platform velocity in darkness were used to study vestibular nystagmus, steps of surround velocity in light were given to study OKN and OKAN, and subjects were rotated in an earth-stationary lighted surround to study the effects of visual-vestibular interactions on per-and postrotatory nystagmus. After each of these stimuli, the after-nystagmus was recorded in darkness. To test for effects of fixation suppression of nystagmus, subjects were shown a stationary surround for variable periods of time during postrotatory nystagmus or OKAN, and the recovery veiocity of nystagmus was determined after they were put back into darkness.