P300 speller BCI with a mobile EEG system: comparison to a traditional amplifier
P300 speller BCI with a mobile EEG system: comparison to a traditional amplifier
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DOI：
10.1088/1741-2560/11/3/036008
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发表时间：
2014-06-01
影响因子：
4
通讯作者：
Debener, Stefan
中科院分区：
文献类型：
--
作者：
De Vos, Maarten;Kroesen, Markus;Debener, Stefan
客观的。在之前的一项研究中，我们提出了一种低成本、小型、无线 EEG 系统，能够在真正移动的户外行走条件下记录单次试验 P300 振幅（Debener 等人 (2012 Psychophysiology 49 1449-53)）。小型无线移动脑电图系统具有巨大的实际优势，因为它们允许在自然环境中记录大脑活动，但这些系统可能会损害脑电图信号质量。在本研究中，我们的目的是评估移动系统可以获得的脑电图信号质量。方法。我们在流行的脑机接口 (BCI) 应用中将我们的移动 14 通道 EEG 系统与最先进的有线实验室 EEG 系统进行了比较。 N = 13 个人重复执行 6 x 6 矩阵 P300 拼写任务。在条件之间，仅改变放大器，而电极放置和电极准备、记录条件、实验刺激和信号处理是相同的。主要结果。对训练和测试精度以及信息传输率 (ITR) 的分析表明，无线移动脑电图放大器的性能与有线实验室脑电图系统一样好。两个放大器之间的 ITR 测试具有非常高的相关性（r = 0.92）。此外，这两种设备的 P300 形貌和振幅非常相似，这反映在高度关联 (r > = 0.77) 上。意义。我们的结论是，使用小型、轻量且可快速设置的移动 EEG 放大器实现高效的 P300 拼写是可能的。该技术促进了 BCI 应用从实验室转移到自然日常生活环境，这是当前 BCI 研究的关键挑战之一。
Objective. In a previous study, we presented a low-cost, small and wireless EEG system enabling the recording of single-trial P300 amplitudes in a truly mobile, outdoor walking condition (Debener et al (2012 Psychophysiology 49 1449-53)). Small and wireless mobile EEG systems have substantial practical advantages as they allow for brain activity recordings in natural environments, but these systems may compromise the EEG signal quality. In this study, we aim to evaluate the EEG signal quality that can be obtained with the mobile system. Approach. We compared our mobile 14-channel EEG system with a state-of-the-art wired laboratory EEG system in a popular brain-computer interface (BCI) application. N = 13 individuals repeatedly performed a 6 x 6 matrix P300 spelling task. Between conditions, only the amplifier was changed, while electrode placement and electrode preparation, recording conditions, experimental stimulation and signal processing were identical. Main results. Analysis of training and testing accuracies and information transfer rate (ITR) revealed that the wireless mobile EEG amplifier performed as good as the wired laboratory EEG system. A very high correlation for testing ITR between both amplifiers was evident (r = 0.92). Moreover the P300 topographies and amplitudes were very similar for both devices, as reflected by high degrees of association (r > = 0.77). Significance. We conclude that efficient P300 spelling with a small, lightweight and quick to set up mobile EEG amplifier is possible. This technology facilitates the transfer of BCI applications from the laboratory to natural daily life environments, one of the key challenges in current BCI research.