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arXiv 2605.29263cs.LG
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用于可穿戴脑电图增强的鲁棒频率校准虚拟脑电通道生成:来自四个额叶电极

Prior-Guided Frequency-Calibrated Virtual EEG Channel Inference from Four Frontal Electrodes for Wearable EEG Augmentation

School of Biomedical Science and Engineering, South China University of Technology(生物医学工程学院,华南理工大学);School of Automation Science and Engineering, South China University of Technology(自动化科学与工程学院,华南理工大学)

Minghao Xiao

AI总结:

提出FAVC-Net网络,通过频率校准从四个额叶电极生成13个未测量通道,联合优化波形保真度、频谱分配和鲁棒性,在PRED+CT数据集上实现最佳波形-频谱性能。

摘要:

低通道可穿戴脑电图(EEG)对于长期监测具有吸引力,但四个额叶电极仅提供稀疏且空间偏斜的分布头皮活动视图。我们提出了FAVC-Net,一个紧凑的频率校准虚拟通道网络,从Fp1、Fp2、F7和F8生成13个未测量的EEG通道。该模型结合了共享多尺度源编码、源状态嵌入、目标条件有符号源块混合、基于GATv2的注意力细化、注意力一致跳跃融合以及弱Welch功率谱密度校准。该框架不是将稀疏到密集的EEG生成视为纯波形匹配任务,而是联合强调幅度保真度、频谱分配、通道频率纹理以及对损坏的可穿戴输入的鲁棒性。在PRED+CT数据集上,FAVC-Net在神经和插值基线中实现了最佳的联合波形-频谱工作点。其时域增益适中,而对数谱距离和PSD KL散度相对于最强的非FAVC比较器分别降低了30.09%和37.98%。在类似可穿戴的源扰动下,该模型保持了频谱保真度并抵抗了频谱崩溃。这些结果支持虚拟EEG通道生成作为双域增强问题,同时强调生成的顶叶和后部通道应解释为从稀疏额叶测量导出的频率校准表示,而非独立的物理记录。

英文摘要:

Low-channel wearable electroencephalography (EEG) is attractive for long-term monitoring, but four frontal electrodes provide only a sparse and spatially biased sampling of the scalp potential field. Virtual-channel methods should therefore be framed not as recovery of independent unmeasured brain activity, but as prior-guided conditional inference of posterior predictive scalp-potential representations at target electrode locations. We present FAVC-Net, a compact frequency-calibrated virtual-channel inference network that estimates 13 target channels from Fp1, Fp2, F7, and F8. The model combines shared multi-scale source encoding, source-state embeddings, target-conditioned signed source-block mixing, GATv2-based attention refinement, attention-consistent skip fusion, and weak Welch power spectral density calibration. The generator is trained as a task-agnostic reconstruction module, without class-label, classification, or CSP-like discriminative constraints, so that the virtual montage remains tied to conditional scalp-potential estimation rather than to a specific downstream decision. On the PRED+CT dataset, FAVC-Net achieved the best joint waveform-spectral operating point among neural and interpolation baselines. Its time-domain gains were modest, whereas log-spectral distance and PSD KL divergence were reduced by 30.50% and 38.94% relative to the strongest non-FAVC comparator. Under wearable-like source perturbations, the model preserved spectral fidelity and channel-frequency texture, with anti-collapse benefits most evident under EMG-like bursts and mixed stress. These results support virtual EEG channels as montage-compatible, frequency-calibrated posterior predictive representations derived from sparse frontal measurements, not as independent substitutes for physically recorded electrodes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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