Target Selection With Hybrid Feature for BCI-Based 2-D Cursor Control
Target Selection With Hybrid Feature for BCI-Based 2-D Cursor Control
复制标题
具有混合功能的目标选择，用于基于 BCI 的 2-D 光标控制
DOI：
10.1109/tbme.2011.2167718
复制
发表时间：
2012-01-01
影响因子：
4.6
通讯作者：
Gu, Zhenghui
中科院分区：
文献类型：
--
作者：
Long, Jinyi;Li, Yuanqing;Gu, Zhenghui
为了控制监视器屏幕上的光标，用户通常需要顺序地执行两个任务。第一个任务是将光标移动到监视器屏幕上的目标（称为2-D光标移动），第二个任务是通过点击感兴趣的目标来选择它，或者通过不点击它来拒绝不感兴趣的目标。在以前的研究中，我们在基于脑电图的大脑中实现了前一个功能，使用运动想象和P300电位分别控制水平和垂直光标移动的计算机接口系统。在这项研究中，目标选择或拒绝功能的实现使用的混合功能，从运动想象和P300电位。具体来说，要选择感兴趣的目标，用户必须将他或她的注意力集中在闪烁的按钮上，以唤起P300电位，同时保持运动想象的空闲状态。否则，用户执行左/右手运动想象，而不注意任何按钮来拒绝目标。我们的数据分析和在线实验结果验证了我们的方法的有效性。所提出的混合功能被证明是更有效的比单独使用的运动想象功能或P300功能。11名受试者参加了我们的在线实验，其中一项试验涉及连续的2-D光标移动和目标选择。每次试验的平均持续时间和靶点选择的平均准确率分别为18.19 s和93.99%，每次靶点选择或拒绝事件均在2 s内完成。
To control a cursor on a monitor screen, a user generally needs to perform two tasks sequentially. The first task is to move the cursor to a target on the monitor screen (termed a 2-D cursor movement), and the second task is either to select a target of interest by clicking on it or to reject a target that is not of interest by not clicking on it. In a previous study, we implemented the former function in an EEG-based brain-computer interface system using motor imagery and the P300 potential to control the horizontal and vertical cursor movements, respectively. In this study, the target selection or rejection functionality is implemented using a hybrid feature from motor imagery and the P300 potential. Specifically, to select the target of interest, the user must focus his or her attention on a flashing button to evoke the P300 potential, while simultaneously maintaining an idle state of motor imagery. Otherwise, the user performs left-/right-hand motor imagery without paying attention to any buttons to reject the target. Our data analysis and online experimental results validate the effectiveness of our approach. The proposed hybrid feature is shown to be more effective than the use of either the motor imagery feature or the P300 feature alone. Eleven subjects attended our online experiment, in which a trial involved sequential 2-D cursor movement and target selection. The average duration of each trial and average accuracy of target selection were 18.19 s and 93.99% , respectively, and each target selection or rejection event was performed within 2 s.