针对视觉脑机接口应用过程中
刺激目标数量多且面积小时视觉响应不强
被试者疲劳时难以将注意力集中在同等大小刺激目标上的问题
设计了一种基于眼动追踪和视觉目标动态可调的脑机接口系统。该系统利用TCP/IP传输协议实现眼动信号和脑电信号的同步采集
并将眼动信号以视觉反馈的形式实时呈现在刺激显示界面
即有提示被试者视线落点位置以便集中注意力到目标刺激上的作用
起到控制目标刺激大小的作用。该系统结合了眼动追踪快速高效和稳态视觉诱发电位脑机接口(SSVEP-BCI)频谱稳定、信噪比高等优势
眼动反馈信号快速调控刺激目标增大并吸引被试者注意
以激发更高的脑电响应和提升识别正确率。将无眼动反馈刺激目标动态可变、无眼动反馈刺激目标不变作为对照组进行实验
结果表明:有眼动反馈目标动态可变的脑机接口系统能比无眼动反馈目标动态可变、无眼动反馈目标不变系统在更短的时间窗内达到80%以上的识别正确率
且具有更高的脑电响应幅值;在3 s时间窗内
有眼动反馈目标动态可变的脑机接口系统的平均识别正确率为92.97%
脑电响应幅值为1.824μV
高于平均识别正确率为88.39%及脑电响应幅值为1.379μV的无眼动反馈目标动态可变系统
且高于平均识别正确率为79.48%及脑电响应幅值为0.987μV的无眼动反馈目标不变系统
这表明有眼动反馈且刺激目标动态可调的脑机接口系统具有更好的识别效果且能诱发更高的脑电响应
工作性能更好。
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