Miao Yangyang, Yin Erwei, Allison Brendan Z, Zhang Yu, Chen Yan, Dong Yi, Wang Xingyu, Hu Dewen, Chchocki Andrzej, Jin Jing
1Key Laboratory of Advanced Control and Optimization for Chemical Processes, Ministry of Education, East China University of Science and Technology, Shanghai, People's Republic of China.
Unmanned Systems Research Center, National Institute of Defense Technology Innovation, Academy of Military Sciences China, Beijing, 100071 People's Republic of China.
Cogn Neurodyn. 2020 Feb;14(1):21-33. doi: 10.1007/s11571-019-09541-0. Epub 2019 Jun 11.
Many studies reported that ERP-based BCIs can provide communication for some people with amyotrophic lateral sclerosis (ALS). ERP-based BCIs often present characters within a matrix that occupies the center of the visual field. However, several studies have identified some concerns with the matrix-based approach. This approach may lead to fatigue and errors resulting from flashing adjacent stimuli, and is impractical for users who might want to use the BCI in tandem with other software or feedback in the center of the monitor. In this paper, we introduce and validate an alternate ERP-based BCI display approach. By presenting stimuli near the periphery of the display, we reduce the adjacency problem and leave the center of the display available for feedback or other applications. Two ERP-based display approaches were tested on 18 ALS patients to: (1) compare performance between a conventional matrix speller paradigm (Matrix-P, mean visual angle 6°) and a new speller paradigm with peripherally distributed stimuli (Peripheral-P, mean visual angle 8.8°); and (2) assess performance while spelling 42 characters online continuously, without a break. In the Peripheral-P condition, 12 subjects attained higher than 80% feedback accuracy during online performance, and 7 of these subjects obtained higher than 90% accuracy. The experimental results showed that the Peripheral-P condition yielded performance comparable to the conventional Matrix-P condition (> 0.05) in accuracy and information transfer rate. This paper introduces a new display approach that leaves the center of the monitor open for feedback and/or other display elements, such as movies, games, art, or displays from other AAC software or conventional software tools.
许多研究报告称，基于事件相关电位（ERP）的脑机接口（BCI）可为一些肌萎缩侧索硬化症（ALS）患者提供交流方式。基于ERP的BCI通常在占据视野中心的矩阵中呈现字符。然而，多项研究发现了基于矩阵的方法存在一些问题。这种方法可能会因相邻刺激闪烁而导致疲劳和错误，对于可能希望将BCI与其他软件或显示器中心的反馈结合使用的用户来说并不实用。在本文中，我们介绍并验证了一种基于ERP的BCI替代显示方法。通过在显示器边缘附近呈现刺激，我们减少了相邻问题，并使显示器中心可用于反馈或其他应用。我们在18名ALS患者身上测试了两种基于ERP的显示方法，以：（1）比较传统矩阵拼写范式（Matrix-P，平均视角6°）和具有周边分布刺激的新拼写范式（Peripheral-P，平均视角8.8°）之间的性能；（2）评估连续在线拼写42个字符且不中断时的性能。在Peripheral-P条件下，12名受试者在在线表现期间反馈准确率高于80%，其中7名受试者准确率高于90%。实验结果表明，Peripheral-P条件在准确率和信息传输率方面产生的性能与传统Matrix-P条件相当（>0.05）。本文介绍了一种新的显示方法，该方法使显示器中心可用于反馈和/或其他显示元素，如电影、游戏、艺术或来自其他辅助交流（AAC）软件或传统软件工具的显示。
