Contreras R, Kolster R, Voss H U, Ghajar J, Suh M, Bahar S
Department of Physics and Astronomy, Center for Neurodynamics, University of Missouri, St. Louis, MO, USA.
J Biol Phys. 2008 Aug;34(3-4):381-92. doi: 10.1007/s10867-008-9092-1. Epub 2008 Jul 24.
Eye-target synchronization is critical for effective smooth pursuit of a moving visual target. We apply the nonlinear dynamical technique of stochastic-phase synchronization to human visual pursuit of a moving target, in both normal and mild traumatic brain-injured (mTBI) patients. We observe significant fatigue effects in all subject populations, in which subjects synchronize better with the target during the first half of the trial than in the second half. The fatigue effect differed, however, between the normal and the mTBI populations and between old and young subpopulations of each group. In some cases, the younger (<or=40 years old) normal subjects performed better than mTBI subjects and also better than older (>40 years old) normal subjects. Our results, however, suggest that further studies will be necessary before a standard of "normal" smooth pursuit synchronization can be developed.
眼动目标同步对于有效平稳追踪移动视觉目标至关重要。我们将随机相位同步的非线性动力学技术应用于正常和轻度创伤性脑损伤（mTBI）患者对移动目标的视觉追踪。我们在所有受试人群中观察到显著的疲劳效应，即受试者在试验的前半段比后半段与目标的同步性更好。然而，正常人群与mTBI人群之间以及每组的老年和青年亚组之间的疲劳效应有所不同。在某些情况下，年龄较小（≤40岁）的正常受试者表现优于mTBI受试者，也优于年龄较大（>40岁）的正常受试者。然而，我们的结果表明，在制定“正常”平稳追踪同步标准之前，还需要进一步研究。
