To test the feasibility of implementing multisensory (auditory and visual) stimulation in combination with electrodes placed on non-hair positions to design more efficient and comfortable Brain-computer interfaces (BCI). Fifteen volunteers participated in the experiments. They were stimulated by visual, auditory and multisensory stimuli set at 37, 38, 39 and 40Hz and at different phases (0°, 90°, 180° and 270°). The electroencephalogram (EEG) was measured from Oz, T7, T8, Tp9 and Tp10 positions. To evaluate the amplitude of the visual and auditory evoked potentials, the signal-to-noise ratio (SNR) was used and the accuracy of detection was calculated using canonical correlation analysis. Additionally, the volunteers were asked about the discomfort of each kind of stimulus. The multisensory stimulation allows for attaining higher SNR on every electrode. Non-hair (Tp9 and Tp10) positions attained SNR and accuracy similar to the ones obtained from occipital positions on visual stimulation. No significant difference was found on the discomfort produced by each kind of stimulation. The results demonstrated that multisensory stimulation can help in obtaining high amplitude steady-state evoked responses with a similar discomfort level. Then, it is possible to design a more efficient and comfortable hybrid-BCI based on multisensory stimulation and electrodes on non-hair positions. The current article proposes a new paradigm for hybrid-BCI based on steady-state evoked potentials measured from the area behind-the-ears and elicited by multisensory stimulation, thus, allowing subjects to achieve similar performance to the one achieved by visual-occipital BCI, but measuring the EEG on a more comfortable electrode location.

中文翻译：

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发际线以下的多感觉刺激和脑电图记录：脑计算机接口的新范例。

为了测试结合放置在非头发位置上的电极实现多感官（听觉和视觉）刺激的可行性，以设计更高效，更舒适的脑机接口（BCI）。15名志愿者参加了实验。它们受到设置在37、38、39和40Hz以及不同相位（0°，90°，180°和270°）的视觉，听觉和多感觉刺激的刺激。从Oz，T7，T8，Tp9和Tp10位置测量脑电图（EEG）。为了评估视觉和听觉诱发电位的幅度，使用了信噪比（SNR），并使用典型相关分析计算了检测的准确性。另外，志愿者被问到每种刺激的不适感。多感觉刺激允许在每个电极上获得更高的SNR。非头发（Tp9和Tp10）位置的SNR和准确性与视觉刺激时从枕骨位置获得的相似。各种刺激产生的不适均无明显差异。结果表明，多感觉刺激可以帮助获得具有类似不适水平的高幅度稳态诱发反应。然后，有可能基于多感官刺激和非头发位置的电极来设计更高效，更舒适的混合BCI。当前文章基于从耳后区域测量并通过多感觉刺激引起的稳态诱发电位，提出了一种混合BCI的新范例。