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    基于时序-拓扑一致性图对比模型的EEG抑郁识别

    Temporal-Topological Consistency Graph Contrastive Model for EEG Depression Recognition

    • 摘要: 重度抑郁症(Major Depressive Disorder,MDD)是严重影响人类健康的精神疾病,现阶段基于对比学习(Contrastive Learning,CL)的脑电信号(ElectroEncephaloGrams,EEG)抑郁识别取得良好效果,但仍存在局限性:目前的 CL 方法主要聚焦于 EEG 的时序一致性,忽略了 EEG 的拓扑一致性,即各通道的抗干扰稳定性与通道间的固有神经生理学关联性。为解决上述问题,本研究提出基于时序-拓扑一致性图对比学习(Temporal-Topological consistency Graph Contrastive Learning,TTGCL)的抑郁识别模型。首先,设计自适应图增强策略,包括基于信噪比与频域能量分布的动态节点增强和基于动态正则约束的边增强,以生成高质量的对比视图。其次,提出跨窗口时序一致性对比(Cross-Window Temporal Consistency Contrast,CWTCC),通过双视图交叉预测学习 EEG 的时序一致性。最后,构建区域-全局图对比(Regional-Global Graph Contrast,RGGC)框架,从局部脑区到全局样本层面学习拓扑一致性。本研究在两个公开 MDD 数据集上分别取得了 96.53% 和 96.33% 的识别准确率,优于现有基线模型。

       

      Abstract: Major Depressive Disorder (MDD) is a mental illness that severely impairs human health. Currently, depression recognition based on Contrastive Learning (CL) for Electroencephalogram (EEG) signals has achieved promising results, yet it still has certain limitations: mainstream CL methods mainly focus on the temporal consistency of EEG signals while neglecting the topological consistency of EEG data, namely the anti-interference stability of individual channels and the inherent neurophysiological correlations between channels. To address the above issues, this paper proposes a novel depression recognition model based on Temporal-Topological consistency Graph Contrastive Learning (TTGCL). First, an adaptive graph augmentation strategy is designed, which includes dynamic node augmentation based on signal-to-noise ratio and frequency-domain energy distribution, as well as edge augmentation based on dynamic regular constraints, to generate high-quality contrastive views. Second, Cross-Window Temporal Consistency Contrast (CWTCC) is proposed to learn the temporal consistency of EEG signals through cross-prediction between dual views. Finally, a Regional-Global Graph Contrast (RGGC) framework is constructed to learn topological consistency from the level of local brain regions to global samples. This study achieves recognition accuracies of 96.53% and 96.33% on two public MDD datasets, respectively, outperforming existing baselines.

       

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