旋转性和平移性视动性眼球震颤具有不同的运动学特征。
Rotational and translational optokinetic nystagmus have different kinematics.
作者信息
Tian Jing, Zee David S, Walker Mark F
机构信息
Department of Neurology, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
出版信息
Vision Res. 2007 Mar;47(7):1003-10. doi: 10.1016/j.visres.2006.12.011. Epub 2007 Feb 22.
We studied the dependence of ocular torsion on eye position during horizontal optokinetic nystagmus (OKN) elicited by random-dot translational motion (tOKN) and prolonged rotation in the light (rOKN). For slow and quick phases, we fit the eye-velocity axis to vertical eye position to determine the tilt angle slope (TAS). The TAS for tOKN was 0.48 for both slow and quick phases, close to what is found during translational motion of the head. The TAS for rOKN was less for both slow (0.11) and quick phases (0.26), close to what is found during rotational motion of the head. Our findings are consistent with the notion that translational and rotational optic flow are processed differently by the brain and that they produce different 3-D eye movement commands that are comparable to the different commands generated in response to vestibular signals when the head is actually translating or rotating.
我们研究了在随机点平移运动诱发的水平视动性眼震（tOKN）和在光照下长时间旋转诱发的水平视动性眼震（rOKN）过程中，眼扭转对眼位的依赖性。对于慢相和快相，我们将眼速轴与垂直眼位进行拟合，以确定倾斜角斜率（TAS）。tOKN慢相和快相的TAS均为0.48，接近头部平移运动时的测量值。rOKN慢相（0.11）和快相（0.26）的TAS均较小，接近头部旋转运动时的测量值。我们的研究结果与以下观点一致：大脑对平移和旋转光流的处理方式不同，并且它们产生不同的三维眼球运动指令，这些指令类似于头部实际平移或旋转时响应前庭信号而产生的不同指令。
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