Soft ionic-hydrogel electrodes for electroencephalography signal recording
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ft ionic-hydrogel electrodes for electroencephalography signal recording 1,2*
SHENG XinJun
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, QIN Zhun , XU HaiPeng , SHU XiaoKang , GU GuoYing 1,2 ZHU XiangYang
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Robotics Institute, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China Received March 31, 2020; accepted May 18, 2020; published online September 10, 2020
Wet gel electrodes have been widely used for electroencephalography (EEG) signal recording, which generally causes skin abrasion and longer preparation time. In this paper, we present soft ionic-hydrogel based electrodes to overcome such drawbacks. In order to conveniently measure the EEG signals, we design the claw-like and patch-like structures for robust connection between metal (Ag/AgCl) electrodes and skin scalps. Next, we experimentally show that the soft ionic-hydrogel based electrodes have similar performance with the conventional wet gel electrodes in terms of the short-circuit noise, electrical impedance, and skin-electrode contact impedance on unprepared human skin, significantly better than dry electrodes and water-based electrodes. We further perform the EEG measurements and steady-state visual evoked potentials (SSVEP) experiments with five subjects to verify the effectiveness of the soft ionic-hydrogel based electrodes. The experimental results demonstrate that our developed soft ionic-hydrogel electrodes can record high-quality EEG signals in a fast and clean way, being a compelling option for EEG-based brain-computer interfaces. brain-computer interface, EEG, electrodes, ionic hydrogel, soft materials Citation:
Sheng X J, Qin Z, Xu H P, et al. Soft ionic-hydrogel electrodes for electroencephalography signal recording. Sci China Tech Sci, 2020, 63, https://doi. org/10.1007/s11431-020-1644-6
1 Introduction Brain-computer interfaces (BCI) enable direct communication between human brain and external devices using cortical activities as the control signal. As a noninvasive measurement of electrical cortical activities, electroencephalography (EEG) provides highly resolved temporal information to reflect the dynamics of brain activities [1]. It has been widely used in BCI researches [2–6] due to its convenience, high mobility, easy setup, and relatively low cost [7]. In order to acquire high-quality EEG signals, conventional Ag/AgCl electrodes are generally used with wet conductive gel to guarantee low skin-electrode impedance (
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