Kim Minju, Kim Jongsu, Heo Dojin, Choi Yunjoo, Lee Taejun, Kim Sung-Phil
Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea.
Front Hum Neurosci. 2021 Feb 26;15:612777. doi: 10.3389/fnhum.2021.612777. eCollection 2021.
Using P300-based brain-computer interfaces (BCIs) in daily life should take into account the user's emotional state because various emotional conditions are likely to influence event-related potentials (ERPs) and consequently the performance of P300-based BCIs. This study aimed at investigating whether external emotional stimuli affect the performance of a P300-based BCI, particularly built for controlling home appliances. We presented a set of emotional auditory stimuli to subjects, which had been selected for each subject based on individual valence scores evaluated , while they were controlling an electric light device using a P300-based BCI. There were four conditions regarding the auditory stimuli, including high valence, low valence, noise, and no sound. As a result, subjects controlled the electric light device using the BCI in real time with a mean accuracy of 88.14%. The overall accuracy and P300 features over most EEG channels did not show a significant difference between the four auditory conditions ( > 0.05). When we measured emotional states using frontal alpha asymmetry (FAA) and compared FAA across the auditory conditions, we also found no significant difference ( > 0.05). Our results suggest that there is no clear evidence to support a hypothesis that external emotional stimuli influence the P300-based BCI performance or the P300 features while people are controlling devices using the BCI in real time. This study may provide useful information for those who are concerned with the implementation of a P300-based BCI in practice.
在日常生活中使用基于P300的脑机接口（BCI）时应考虑用户的情绪状态，因为各种情绪状况可能会影响事件相关电位（ERP），进而影响基于P300的BCI的性能。本研究旨在调查外部情绪刺激是否会影响基于P300的BCI的性能，特别是专为控制家用电器而设计的BCI。我们向受试者呈现了一组情绪听觉刺激，这些刺激是根据每个受试者的个体效价得分选择的，同时他们使用基于P300的BCI控制电灯设备。关于听觉刺激有四种情况，包括高愉悦度、低愉悦度、噪音和无声音。结果，受试者使用BCI实时控制电灯设备，平均准确率为88.14%。在大多数脑电图通道上，四种听觉条件下的总体准确率和P300特征没有显著差异（>0.05）。当我们使用额叶α不对称性（FAA）测量情绪状态并比较不同听觉条件下的FAA时，我们也没有发现显著差异（>0.05）。我们的结果表明，没有明确证据支持这样一种假设，即当人们使用BCI实时控制设备时，外部情绪刺激会影响基于P300的BCI性能或P300特征。这项研究可能会为那些关注在实际中应用基于P300的BCI的人提供有用信息。
