Magnusson M, Pyykkö I, Jäntti V
Am J Otolaryngol. 1985 Nov-Dec;6(6):419-25. doi: 10.1016/s0196-0709(85)80020-x.
The effect of alertness and visual attention on optokinetic nystagmus (OKN) and optokinetic after-nystagmus (OKAN) was studied in 20 volunteers. Electroencephalographic (EEG) activity was recorded over the occipital lobe. Exposure to sound and vibration caused a significant increase in the mean slow-phase velocity of OKN, whereas its maximum slow-phase velocity remained unaffected. Vibration tended to increase the mean slow-phase velocity of OKN more than sound did, though the difference was not statistically significant. Vibration also significantly increased the OKAN. When alpha rhythm appeared in the occipital EEG during OKN, the velocity of concurrent slow phases was reduced. However, the periods of alpha rhythm did not differ between the different stimulus conditions. The findings suggest that sound and vibration activate the subcortical optokinetic mechanism, thus causing an increase in the mean velocity of OKN. Abatement of visual attention is reflected in temporary reduction of OKN in conjunction with the appearance of alpha waves and is to be interpreted as transient quiescence of the cortical optokinetic mechanism.
在20名志愿者中研究了警觉性和视觉注意力对视动性眼球震颤（OKN）和视动性后眼球震颤（OKAN）的影响。在枕叶记录脑电图（EEG）活动。暴露于声音和振动会导致OKN的平均慢相速度显著增加，而其最大慢相速度不受影响。振动使OKN的平均慢相速度增加的趋势比声音更明显，尽管差异无统计学意义。振动也显著增加了OKAN。当在OKN期间枕叶EEG出现α节律时，同时出现的慢相速度降低。然而，不同刺激条件下α节律的持续时间没有差异。研究结果表明，声音和振动激活了皮层下视动机制，从而导致OKN平均速度增加。视觉注意力的减弱表现为OKN暂时降低并伴有α波出现，这应被解释为皮层视动机制的短暂静止。
