title: A Wearable Channel Selection-Based Brain-Computer Interface for Motor Imagery Detection.
abstract: Motor imagery-based brain-computer interface (BCI) is a communication interface between an external machine and the brain. Many kinds of spatial filters are used in BCIs to enhance the electroencephalography (EEG) features related to motor imagery. The approach of channel selection, developed to reserve meaningful EEG channels, is also an important technique for the development of BCIs. However, current BCI systems require a conventional EEG machine and EEG electrodes with conductive gel to acquire multi-channel EEG signals and then transmit these EEG signals to the back-end computer to perform the approach of channel selection. This reduces the convenience of use in daily life and increases the limitations of BCI applications. In order to improve the above issues, a novel wearable channel selection-based brain-computer interface is proposed. Here, retractable comb-shaped active dry electrodes are designed to measure the EEG signals on a hairy site, without conductive gel. By the design of analog CAR spatial filters and the firmware of EEG acquisition module, the function of spatial filters could be performed without any calculation, and channel selection could be performed in the front-end device to improve the practicability of detecting motor imagery in the wearable EEG device directly or in commercial mobile phones or tablets, which may have relatively low system specifications. Finally, the performance of the proposed BCI is investigated, and the experimental results show that the proposed system is a good wearable BCI system prototype.
authors: Institute of Electrical and Control Engineering, National Chiao Tung University, Hsinchu 300, Taiwan. chichun86@gmail.com.|Department of Engineering and Maintenance, Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan. chichun86@gmail.com.
authors: Chi-Chun
authors: CC
authors: Lo
authors: Department of Engineering and Maintenance, Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan. g101@cgmh.org.tw.
authors: Tsung-Yi
authors: TY
authors: Chien
authors: Institute of Imaging and Biomedical Photonics, National Chiao Tung University, Tainan 711, Taiwan. e01052788@hotmail.com.
authors: Yu-Chun
authors: YC
authors: Chen
authors: Institute of Electrical and Control Engineering, National Chiao Tung University, Hsinchu 300, Taiwan. shanghot@mail.nctu.edu.tw.
authors: Shang-Ho
authors: SH
authors: Tsai
authors: Department of Electronics Egineering, National Chiao Tung University, Hsinchu 300, Taiwan. wfang@mail.nctu.edu.tw.
authors: Wai-Chi
authors: WC
authors: Fang
authors: Institute of Imaging and Biomedical Photonics, National Chiao Tung University, Tainan 711, Taiwan. borshyhlin@mail.nctu.edu.tw.|Department of Medical Research, Chi-Mei Medical Center, Tainan 710, Taiwan. borshyhlin@mail.nctu.edu.tw.
authors: Bor-Shyh
authors: BS
authors: Lin
mesh_terms: D000465:Algorithms; D015374:Biosensing Techniques / Q000295:instrumentation*; D001921:Brain / Q000502:physiology; D062207:Brain-Computer Interfaces; D004566:Electrodes; D004569:Electroencephalography; D006801:Humans
keywords: brain-computer interface; channel selection; motor imagery; spatial filter