Error-related EEG potentials generated during simulated brain-computer interaction
Error-related EEG potentials generated during simulated brain-computer interaction
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DOI：
10.1109/tbme.2007.908083
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发表时间：
2008-03-01
影响因子：
4.6
通讯作者：
Millan, Jose del R.
中科院分区：
文献类型：
--
作者：
Ferrez, Pierre W.;Millan, Jose del R.
脑机接口(BCI)在识别受试者意图时容易出现错误。一种改进BCI准确性的优雅方法包括直接基于在错误发生后立即记录的脑电(EEG)中是否存在错误相关电位(ERRP)的验证过程。一些研究表明，ERRP存在于典型的选择性反应任务中。然而，在脑-机接口的背景下，中心问题是：“在识别受试者意图的过程中，当接口犯错误时，是否也会引发ERRP？”因此，我们探索了ERRP是否也遵循指示模拟BCI接口的不正确响应的反馈。五名健康的志愿者参与了一项新的人-机器人互动实验，这似乎证实了之前报道的一种新型ERRP的存在。然而，为了利用这些ERRP，我们需要在每个单独的试验中使用与BCI反应相关的反馈之后的短窗口来检测它们。使用三个月前记录的数据建立的分类器，我们获得了正确和错误单次试验的平均识别率分别为83.5%和79.2%。
Brain-computer interfaces (BCIs) are prone to errors in the recognition of subject's intent. An elegant approach to improve the accuracy of BCIs consists in a verification procedure directly based on the presence of error-related potentials (ErrP) in the electroencephalogram (EEG) recorded right after the occurrence of an error. Several studies show the presence of ErrP in typical choice reaction tasks. However, in the context of a BCI, the central question is: "Are ErrP also elicited when the error is made by the interface during the recognition of the subject's intent?" We have thus explored whether ErrP also follow a feedback indicating incorrect responses of the simulated BCI interface. Five healthy volunteer subjects participated in a new human-robot interaction experiment, which seem to confirm the previously reported presence of a new kind of ErrP. However, in order to exploit these ErrP, we need to detect them in each single trial using a short window following the feedback associated to the response of the BCI. We have achieved an average recognition rate of correct and erroneous single trials of 83.5% and 79.2%, respectively, using a classifier built with data recorded up to three months earlier.