采用深度强化学习（DRL）刺激的干接触式耳脑电图系统，用于运动伪影抵消时的连续电极-皮肤失配监测
A Dry-Contact Ear-EEG System With Continuous Electrode-Skin Impedance Mismatch Monitoring for Motion Artifact Cancellation Using DRL Stimulus
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中文总结 AI 辅助
本文提出首个基于DRL刺激的干接触式Ear-EEG系统，通过监测ESI失配实现运动伪影抵消，在4名受试者的三类动作测试中显著降低伪影功率且保留α波段神经活动。
中文摘要 AI 辅助
干接触式耳脑电图（Ear-EEG）可实现可穿戴神经监测，但运动引起的电极间电极-皮肤阻抗（ESI）失配会严重降低信号质量。据所知，本文提出了首个概念验证干接触式Ear-EEG系统，该系统利用驱动右腿（DRL）刺激进行连续ESI失配监测，可实现在线自适应运动伪影抵消。通过DRL电极注入1kHz正弦刺激，利用带通滤波和解调将注入载波的响应与脑电（EEG）分离，随后将其用于提取ESI失配信息，作为归一化最小均方自适应滤波器及后续Hampel滤波阶段的参考输入。为评估伪影抑制与神经活动保留效果，分析了4名健康受试者在点头、电极敲击、下颌咬紧动作中的α波段EEG活动，该系统实现了伪影功率分别降低6.5、12.6、9.0 dB（对应77.6%、92.8%、86.4%），且处理后α波段调制仍清晰可见，这证明了基于DRL刺激的ESI失配监测在可穿戴干接触式Ear-EEG的运动伪影抵消中具备可行性。
英文摘要
Dry-contact ear-electroencephalography (Ear-EEG) enables wearable neural monitoring. However, motion induced electrode-skin impedance (ESI) mismatches between electrodes can severely degrade signal quality. To the best of our knowledge, this paper presents the first proof-of-concept dry-contact EarEEG system that uses a driven-right-leg (DRL) stimulus for continuous ESI mismatch monitoring, enabling online adaptive motion artifact cancellation. A 1 kHz sinusoidal stimulus is injected through the DRL electrode. The resulting response to the injected carrier is separated from the EEG using bandpass filtering and demodulation, and then used to extract the ESI mismatch information as the reference input for a normalized least-mean-square adaptive filter followed by a Hampel filtering stage. To evaluate artifact suppression and preservation of neural activity, alpha-band EEG activity was analyzed involving four healthy participants performing head nodding, electrode tapping, and jaw clenching. The system achieved artifact power reductions of 6.5, 12.6, and 9.0 dB (77.6%, 92.8%, and 86.4%, respectively) while alpha-band modulation remained clearly observable after processing. This demonstrates the feasibility of DRL-stimulusbased ESI mismatch monitoring for motion artifact cancellation in wearable dry-contact Ear-EEG.
发表机构
- University of Moratuwa（莫鲁图瓦大学）
- University of British Columbia（不列颠哥伦比亚大学）
- Aarhus University（奥胡斯大学）
- Cirtec Medical Corporation（赛特克医疗公司）
机构由 AI 辅助整理，请以论文原文为准。
