Tweed D, Vilis T
Department of Physiology, University of Western Ontario, London, Canada.
Vision Res. 1990;30(1):111-27. doi: 10.1016/0042-6989(90)90131-4.
Measurements of angular position and velocity vectors of the eye in three human and three monkey subjects showed that: (1) position vectors lie roughly in a single plane, in accordance with Listing's law, between and during saccades; (2) primary position of the eye is often far from the centre of the oculomotor range. (3) saccades have nearly-fixed rotation axes, which tilt out of Listing's plane in a systematic way depending on current eye position. Findings 1 and 3 show that saccadic control signals accurately reflect the properties of three-dimensional rotations, as predicted by a new quaternion model of the saccadic system; models that approximate rotational kinematics using vectorial addition and integration do not predict these findings.
(1) 在扫视之间和扫视过程中，位置矢量大致位于一个平面内，符合利斯廷定律；(2) 眼睛的初始位置通常远离动眼范围的中心；(3) 扫视具有近乎固定的旋转轴，该旋转轴会根据当前眼睛位置以系统的方式倾斜出利斯廷平面。研究结果1和3表明，扫视控制信号准确反映了三维旋转的特性，正如扫视系统的新四元数模型所预测的那样；使用矢量加法和积分来近似旋转运动学的模型无法预测这些结果。
