Feature combination for classifying single-trial ECoG during motor imagery of different sessions  

作　　者：Wei Qingguo Meng Fei Wang Yijun Gao Xiaorong Gao Shangkai 

机构地区：[1]Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China [2]Department of Electronic Engineering, School of Information, Nanchang University, Nanchang 330029, China

出　　处：《Progress in Natural Science:Materials International》2007年第7期851-858,共8页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China(Grant No.60318001);Beijing Natural Science Foundation(Grant No.3051001)

摘　　要：The input signals of brain-computer interfaces （BCIs） may be either scalp electroencephalogram （EEG） or electrocorticogram （ECoG） recorded from subdural electrodes. To make BCIs practical, the classifiers for discriminating different brain states must have the ability of session-to-session transfer. This paper proposes an algorithm for classifying single-trial ECoG during motor imagery of different sessions. Three features, derived from two physiological phenomena, movement-related potentials （MRP） and event-related desynchronization （ERD）, and extracted by common spatial subspace decomposition （CSSD） and waveform mean, are combined to perform classification tasks. The specific signal processing methods utilized are described in detail. The algorithm was successfully applied to Data Set Ⅰof BCI Competition Ⅱ, and achieved a classification accuracy of 91% on test set.大脑计算机接口(BCI ) 的输入信号可以是任何一个头皮脑电图(EEG ) 或 electrocorticogram (ECoG ) 从潜水艇记录硬脑膜的电极。使 BCI 实际，为区别不同大脑状态的分类器必须有 session-to-session 转移的能力。这篇论文为在不同会议的马达形象期间分类单个试用的 ECoG 建议一个算法。三个特征，源于二生理的现象，运动相关的潜力(MRP ) 和事件相关的 desynchronization (ERD ) ，并且由普通空间潜水艇空间分解(CSSD ) 和波形平均数提取了，被联合执行分类任务。利用的特定的信号处理方法详细被描述。算法成功地被用于设置的数据我 BCI 比赛 III，并且在测试集合上完成了 91% 的分类精确性。

关 键 词：brain-computer interface （BCI） electrocorticogram （ECoG） session-to-session transfer feature combination movement-related potentials （MRP） event-related desynchronization （ERD）. 

分 类 号：R857.14[医药卫生—航空、航天与航海医学]