Straumann D, Zee D S, Solomon D, Lasker A G, Roberts D C
Department of Neurology, Johns Hopkins Hospital, Baltimore, MD 21287, USA.
Vision Res. 1995 Dec;35(23-24):3321-34. doi: 10.1016/0042-6989(95)00091-r.
In five normal subjects, we analyzed uncalled for torsion (blips) during and after horizontal and vertical saccades. Torsion was defined as movement out of Listing's plane. During horizontal saccades in downward gaze the abducting eye extorted and the adducting eye intorted. The direction of the blips reversed in upward gaze. Peak torsional amplitudes (up to 1-2 deg) were always reached during saccades; drifts back to Listing's plane outlasted the saccades. Torsion of the extorting eye was larger than that of the intorting eye, producing a transient positive cyclovergence. Torsion and cyclovergence evoked by vertical saccades were also stereotyped in each eye, but showed idiosyncratic differences among subjects. We conclude that Listing's law is violated during saccades. Transient saccade-evoked torsion might reflect properties of the three-dimensional velocity-to-position integrator and/or the ocular plant.
在五名正常受试者中，我们分析了水平和垂直扫视期间及之后不必要的扭转（尖峰信号）。扭转被定义为偏离利斯廷平面的运动。在向下注视时的水平扫视中，外展眼外旋，内收眼内旋。在向上注视时，尖峰信号的方向相反。峰值扭转幅度（高达1 - 2度）总是在扫视期间达到；回到利斯廷平面的漂移持续时间超过扫视。外旋眼的扭转大于内旋眼，产生短暂的正性旋转性集合。垂直扫视诱发的扭转和旋转性集合在每只眼中也具有刻板性，但在受试者之间存在个体差异。我们得出结论，扫视期间违反了利斯廷定律。短暂的扫视诱发扭转可能反映了三维速度到位置积分器和/或眼动装置的特性。
