Paek Andrew Y, Kilicarslan Atilla, Korenko Branislav, Gerginov Vladislav, Knappe Svenja, Contreras-Vidal Jose L
Annu Int Conf IEEE Eng Med Biol Soc. 2020 Jul;2020:3420-3423. doi: 10.1109/EMBC44109.2020.9176159.
Brain Computer Interfaces (BCIs) allow individuals to control devices, machines and prostheses with their thoughts. Most feasibility studies with BCIs have utilized scalp electroencephalography (EEG), due to it being accessible, noninvasive, and portable. While BCIs have been studied with magnetoencephalography (MEG), the modality has limited applications due to the large immobile hardware. Here we propose that room-temperature, optically-pumped magnetometers (OPMs) can potentially serve a portable modality that can be used for BCIs. OPMs have the added advantage that low-frequency neuromagnetic fields are not affected by volume conduction, which is known to distort EEG signals. In this feasibility study, we tested an OPM system with a real-time BCI where able bodied participants controlled a cursor to reach two targets. This BCI system used alpha and beta-band power modulations associated with hand movements. Our preliminary results show significant alpha and beta-band desynchronization due to movement, as found in previous literature.
脑机接口（BCIs）使个体能够用他们的思想来控制设备、机器和假肢。由于头皮脑电图（EEG）具有可获取、非侵入性和便携性等特点，大多数脑机接口的可行性研究都采用了这种技术。虽然也有使用脑磁图（MEG）对脑机接口进行研究，但由于其硬件体积庞大且不可移动，该技术的应用受到限制。在此，我们提出室温光泵磁力仪（OPMs）可能成为一种可用于脑机接口的便携式技术。光泵磁力仪还有一个额外的优势，即低频神经磁场不受容积传导的影响，而容积传导已知会使脑电图信号失真。在这项可行性研究中，我们使用一个实时脑机接口测试了一个光泵磁力仪系统，健全的参与者通过该系统控制光标到达两个目标。这个脑机接口系统利用了与手部运动相关的α和β波段功率调制。我们的初步结果显示，正如先前文献中所发现的那样，运动导致了显著的α和β波段去同步化。
