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arXiv · 2603.02255

MEBM-Speech: Multi-scale Enhanced BrainMagic for Robust MEG Speech Detection

Li Songyi·Zheng Linze·Liang Jinghua·Zhang Zifeng
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Abstract

We propose MEBM-Speech, a multi-scale enhanced neural decoder for speech activity detection from non-invasive magnetoencephalography (MEG) signals. Built upon the BrainMagic backbone, MEBM-Speech integrates three complementary temporal modeling mechanisms: a multi-scale convolutional module for short-term pattern extraction, a bidirectional LSTM (BiLSTM) for long-range context modeling, and a depthwise separable convolutional layer for efficient cross-scale feature fusion. A lightweight temporal jittering strategy and average pooling further improve onset robustness and boundary stability. The model performs continuous probabilistic decoding of MEG signals, enabling fine-grained detection of speech versus silence states - an ability crucial for both cognitive neuroscience and clinical applications. Comprehensive evaluations on the LibriBrain Competition 2025 Track1 benchmark demonstrate strong performance, achieving an average F1 macro of 89.3% on the validation set and comparable results on the official test leaderboard. These findings highlight the effectiveness of multi-scale temporal representation learning for robust MEG-based speech decoding.

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BibTeXRIS

Li Songyi, Zheng Linze, Liang Jinghua, Zhang Zifeng. 2026-02-27. MEBM-Speech: Multi-scale Enhanced BrainMagic for Robust MEG Speech Detection. https://arxiv.org/abs/2603.02255

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