Eye movements induced by linear acceleration on a parallel swing.
Eye movements induced by linear acceleration on a parallel swing.
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平行摆动时线性加速度引起的眼球运动。
DOI：
10.1152/jn.1988.60.6.2000
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发表时间：
1988
影响因子：
2.5
通讯作者：
Yee,RD
中科院分区：
文献类型：
--
作者：
Baloh,RW;Beykirch,K;Honrubia,V;Yee,RD
1.水平和垂直眼球运动诱导正常人受试者的正弦线性加速度上的平行摆动。摆动频率为0.3 Hz，峰值水平和垂直加速度范围分别为0.17至0.48和0.03至0.34 g。眼球运动记录与巩膜搜索线圈技术。2.受试者坐在黑暗中刺激耳石-眼反射，沿耳间轴的摆动位移沿着引起水平眼球运动，平均平移敏感度（ST）（峰值眼球速度/峰值摆动速度）为3.8至4.7度/m，平均相移（眼球速度再摆动速度）为-152至-160度。垂直眼球运动的ST和相位值的水平眼球运动。当受试者面朝前坐着，水平线加速度发生在枕鼻轴，几乎相同的垂直，但没有一致的水平眼球运动诱导。在每种情况下，水平和垂直的眼球运动与挥杆的水平和垂直位移成正比。3.当受试者坐在光中看着地球固定的目标（协同视觉-前庭相互作用）时，诱导的眼睛运动的增益（峰值眼睛速度/峰值目标速度）接近1，并且相位是补偿性的（即，大约-180度）（甚至在追踪增益小于1的目标速度下）。受试者能够抑制耳石眼反应，通过固定在一个目标连接到秋千。与在黑暗中没有固定目标的测量相比，ST降低了一个数量级。4.受试者能够通过想象一个固定在地球上的目标来增强ST（水平和垂直）。将想象目标的距离减半，大约是ST的两倍。在两个测试的三个主题，ST测量与精神警觉在黑暗中自适应增加（约一倍）后，20分钟的持续协同视觉前庭相互作用。未显示ST适应性增加的受试者从10名正常受试者中的最高值开始。6.我们的结论是，在头部线性加速度期间，耳石信号被正确地解释为头部移动，而不是重力矢量的旋转。耳石-眼反射与视觉追踪系统相互作用，以改善头部平移运动期间的眼稳定性。
1. Horizontal and vertical eye movements were induced in normal human subjects by sinusoidal linear acceleration on a parallel swing. The swing frequency was 0.3 Hz and the peak horizontal and vertical acceleration ranged from 0.17 to 0.48 and 0.03 to 0.34 g, respectively. Eye movements were recorded with the scleral search coil technique. 2. With the subjects seated in the dark to stimulate the otolith-ocular reflex, swing displacement along the interaural axis induced horizontal eye movements with a mean sensitivity to translation (ST) (peak eye velocity/peak swing velocity) of 3.8 to 4.7 degrees/m and a mean phase shift (eye velocity re swing velocity) of -152 to -160 degrees. Vertical eye movements had ST and phase values comparable to those of the horizontal eye movements. When the subjects sat facing forward so that the horizontal linear accelerations occurred in the occipitonasal axis, almost identical vertical but no consistent horizontal eye movements were induced. In each case the horizontal and vertical eye movements were proportional to the horizontal and vertical displacement of the swing. 3. With the subject seated in the light looking to an earth-fixed target (synergistic visual-vestibular interaction), the gain (peak eye velocity/peak target velocity) of induced eye movements was near 1, and the phase was compensatory (i.e., approximately -180 degrees) for all stimuli (even at target velocities at which the pursuit gain was less than 1). Subjects were able to suppress the otolith-ocular responses by fixating on a target attached to the swing. The ST decreased by an order of magnitude compared with measurements in the dark without a fixation target. 4. Subjects were able to augment the ST (horizontal and vertical) by imagining an earth-fixed target. Halving the distance of the imagined target approximately doubled the ST. 5. In two of three subjects tested, the ST measured with mental alerting in the dark adaptively increased (approximately doubled) after 20 min of continuous synergistic visual-vestibular interaction. The subject who did not show an adaptive increase in ST began with the highest value of the 10 normal subjects. 6. We conclude that during linear accelerations of the head the otolith signal is correctly interpreted as head movement and not rotation of the gravity vector. The otolith-ocular reflex interacts with the visual pursuit system to improve ocular stability during translational head movements.