| 제목 |
Development of a flickering action video based SSVEP triggered BCI-FES for action observation game |
| 소속 |
Nowon Eulji University Hospital, Department of Rehabilitation Medicine1, College of Natural Science, Keimyung University, Department of Bioscience2, School of Medicine, Keimyung University, Department of Biomedical Engineering3 |
| 저자 |
Hyoseon Choi1*†, Jisang Jung1, Youn Joo Kang1, Ji Eun Son 2, Hyunmi Lim3, Jeonghun Ku3† |
BACKGROUND: Utilization of FES while watching the action video can be expected to stimulate the MNS synergistically to consequently improve rehabilitation effects in patients with upper limb impairment. In this study, a steady state visual evoked potential (SSVEP) triggered brain computer interface (BCI)-functional electrical stimulation (FES) based action observation game featuring a flickering action video was designed. In particular, the synergetic effect of the game was investigated by combining the action observation paradigm with BCI based FES.
METHODS: 11 right-handed healthy subjects were recruited. The BCI-FES system was contrasted under two conditions: with (i) flickering action video condition where the upper limb of the subject was periodically raised and lowered in the video area of the game and (ii) flickering noise video condition where the brightness and contrast of the video matched those of the action video. The game program featured a farmer plucking apples by raising the arm and a flickering video area adjacent to the farmer. The video play and raising of the farmer’s arm occurred synchronously if a detectable SSVEP was evoked while watching the flickering video. Subsequently, wrist extension movements were induced by electrical stimulation. The game was played in the same manner for the two conditions. The classification and analysis of EEG signals were based on 19 channels. The differences in brain activation in response to the two conditions were examined by Paired-t test.
RESULTS: The results indicate that T3 and P3 channels exhibited greater Mu suppression in 8–13 Hz for the action video than the noise video. Furthermore, T4, C4, and P4 channels indicated augmented high beta (21–30 Hz) for the action in contrast to the noise video. Finally, T4 indicated suppressed low beta (14–20 Hz) for the action video in contrast to the noise video (Figure 1).
CONCLUSION: The flickering action video based BCI-FES system induced a more synergetic effect on cortical activation than the flickering noise based system. The results provide preliminary evidence of possibility of rehabilitation game based on utilizing the action video with FES in neurorehabilitation field in the future.
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Frequency components obtained from channels (a) T3, (b) T4, (c) C3, (d) C4, (e) P3, and (f) P4 while watching action video (red) and noise videos (blue) of the game program.
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