Stava M W, Huffman M D, Baker R S, Epstein A D, Porter J D
Department of Ophthalmology, University of Kentucky Medical Center, Lexington 40536-0284.
Invest Ophthalmol Vis Sci. 1994 Oct;35(11):3966-71.
To provide a quantitative description of the conjugacy of human eyelid movements during spontaneous blinks.
Eyelid movements occurring during spontaneous blinks were recorded bilaterally using a modification of the electromagnetic search coil technique. In off-line analyses, covariation of amplitude, peak velocity, and duration of blink down phases were determined for the two eyelids. Interocular differences in the timing of blink onset and offset, and time to peak velocity, also were evaluated.
Human blink motor control systems act to link tightly the spatial and temporal characteristics of movements of the two eyelids. Data show that human spontaneous blinks are conjugate. Analysis of interocular covariation of blink amplitude, peak velocity, and duration yielded linear functions with high correlation coefficients. Interocular comparison of eyelid movement durations during blinks showed a particularly high correlation. There were negligible interocular differences in blink down-phase onset time, termination time, and time to peak velocity. A small percentage of blinks exhibited interocular differences in amplitude and peak velocity of > 20%; however, even in these cases, blink duration remained tightly linked.
Spatial and temporal properties of eyelid movements occurring during spontaneous blinks are conjugate. These data support the hypothesis that a bilateral gating mechanism regulates blink duration. Elements downstream from the gate may differentially and unilaterally alter blink amplitude and peak velocity, but the duration of blinks remains time-locked for the two eyelids.
定量描述人在自然眨眼时眼睑运动的共轭性。
采用改良的电磁搜索线圈技术双侧记录自然眨眼时的眼睑运动。在离线分析中，确定了两只眼睑眨眼向下阶段的幅度、峰值速度和持续时间的协变情况。还评估了眨眼开始和结束时间以及达到峰值速度时间的双眼差异。
人类眨眼运动控制系统的作用是紧密联系两只眼睑运动的空间和时间特征。数据表明人类自然眨眼是共轭的。对眨眼幅度、峰值速度和持续时间的双眼协变分析产生了具有高相关系数的线性函数。眨眼期间眼睑运动持续时间的双眼比较显示出特别高的相关性。眨眼向下阶段的开始时间、终止时间和达到峰值速度的时间在双眼之间的差异可忽略不计。一小部分眨眼在幅度和峰值速度上表现出大于20%的双眼差异；然而，即使在这些情况下，眨眼持续时间仍然紧密相关。
自然眨眼时发生的眼睑运动的空间和时间特性是共轭的。这些数据支持双侧门控机制调节眨眼持续时间的假说。门控下游的元件可能会差异性地、单侧地改变眨眼幅度和峰值速度，但两只眼睑的眨眼持续时间仍然是时间锁定的。
