Development of EFRP (Eye-Fixation-Related-Potential) real time analysis System

眼动记录显示，当受试者看着什么东西时，眼球运动(扫视)和眼睛注视组成了一种第一步的IKE模式。这种特殊的事件相关脑电位被称为眼睛注视相关电位(EFRP)，它可以通过对眼跳终止时的脑电进行平均得到。我们已经完成了用于EFRP分析的新系统的原型。该系统的显著特点是可以在受试者移动眼睛的情况下测量事件相关电位。该系统能以一种简单的平均方法处理14个大脑半球的脑电数据，并能实时显示与大脑活动有关的地形图。该系统已申请专利，并在多种条件下进行了测试。用新系统对14个城市的脑电进行了处理。灯光级别被降低了。当一名受试者看着一张照片时，他的名字被叫来分散他的注意力。当视觉条件发生变化时，我们可以实时观察到EFRP图的连续变化。当他们的注意力被听觉刺激分散时，一些受试者会在地形图上表现出变化。同时，我们正在对与该系统相关的感知和注意的许多基本问题进行研究。

Eye movement record shows a step-1 ike pattern consisting of saccadic eye movements (saccades) and eye fixationswhen a subject Iooks at something. This speciaI event reIated brain potentiaIs is called the eye fixation related potential (EFRP), which can be obtained with averaging EEGs at terminations of saccades. We have completed a prototype of the new system for analyzing the EFRP. The distinctive feature of the system is that we can measure the ERP under the conditions where a subject moves eyes. This systemcanprocess EEGdata from 14cites onthe headwith a sI idingaveragemethod and can dispIay the topographical map related to the brain activities in real time. The system has been applied for a patent.We tested the systemunder severaI conditions. EEGs from 14cites were processedwith the new system. The Iighting level was lowered. While a subject looked at a picture, his namewas called to distract his attention. We could observe the continuous variations of the map of EFRP in real time, when visual conditions varied. Some subjects showed the change in the topographical map, when their attention was distracted by the auditory stimuli. Simultaneously, we are doing research on many basic problems of perception and attention related to the system.