Department of Mathematics and Statistics, Colby College, Waterville, ME, USA.
J Vestib Res. 2011;21(4):193-208. doi: 10.3233/VES-2011-0416.
During passive whole-body motion in the dark, the motion perceived by subjects may or may not be veridical. Either way, reflexive eye movements are typically compensatory for the perceived motion. However, studies are discovering that for certain motions, the perceived motion and eye movements are incompatible. The incompatibility has not been explained by basic differences in gain or time constants of decay. This paper uses three-dimensional modeling to investigate gondola centrifugation (with a tilting carriage) and off-vertical axis rotation. The first goal was to determine whether known differences between perceived motions and eye movements are true differences when all three-dimensional combinations of angular and linear components are considered. The second goal was to identify the likely areas of processing in which perceived motions match or differ from eye movements, whether in angular components, linear components and/or dynamics. The results were that perceived motions are more compatible with eye movements in three dimensions than the one-dimensional components indicate, and that they differ more in their linear than their angular components. In addition, while eye movements are consistent with linear filtering processes, perceived motion has dynamics that cannot be explained by basic differences in time constants, filtering, or standard GIF-resolution processes.
在黑暗中被动进行全身运动时，受试者感知到的运动可能是真实的，也可能不是真实的。无论哪种方式，反射性眼球运动通常都是对感知运动的补偿。然而，研究发现，对于某些运动，感知运动和眼球运动是不兼容的。这种不兼容性不能用增益或时间常数衰减的基本差异来解释。本文使用三维建模来研究吊舱离心（带倾斜车架）和偏离垂直轴旋转。第一个目标是确定当考虑所有三维角和线性分量的组合时，感知运动和眼球运动之间的已知差异是否是真实的差异。第二个目标是确定感知运动与眼球运动匹配或不同的可能处理区域，无论是在角分量、线性分量和/或动力学方面。结果表明，感知运动在三维空间中的兼容性比一维分量所指示的要高，而且它们在线性分量上的差异大于在角分量上的差异。此外，虽然眼球运动与线性滤波过程一致，但感知运动的动力学不能用时间常数、滤波或标准 GIF 分辨率过程的基本差异来解释。
