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NEXUS-MI: Communication-Aware Federated Personalization for Gateway-Coordinated Motor-Imagery Brain-Computer Interfaces

arXiv 2609.09786 ↗First posted 9 Sep 2026cs.LG cs.NIcited by 0

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Abstract (arXiv)

Electroencephalography (EEG)-based motor-imagery brain-computer interfaces (MI-BCIs) vary across subjects and sessions, complicating personalization from limited calibration data. Federated learning can exploit shared representations without centralizing raw EEG, but existing federated MI studies largely assume regular synchronization. We introduce NEXUS-MI, a gateway-coordinated federated personalization framework that treats synchronization as a coupled learning-and-communication control problem. Raw EEG and classifier heads remain local, while an edge coordinator maintains the shared backbone. We evaluate NEXUS-MI through offline replay using BCI Competition IV Dataset 2a (BCICIV-2a; 9 subjects, 4 classes) and OpenBMI (54 subjects, 2 classes). Session 1 supports backbone learning, and Session 2 provides limited-calibration personalization and held-out testing. An ideal-link reference and six heterogeneous-link policies characterize gateway participation, buffering, stale-update admission, and backbone-download control. The principal comparison holds delayed-update handling fixed while contrasting non-adaptive and communication-aware synchronization. Paired subject-level comparisons use Holm adjustment, and robustness across five matched realizations is assessed by hierarchical bootstrap. Communication-aware coordination reduced server-to-client backbone traffic by approximately 42% on both datasets, while cohort-level accuracy differences were small and realization-dependent. Cohort averages also concealed subject-level vulnerability, with losses reaching approximately 12 percentage points on BCICIV-2a relative to the ideal-link reference. These findings establish gateway synchronization as an explicit design variable in federated MI personalization and motivate joint evaluation of personalized accuracy, communication cost, update freshness, and subject-level reliability.

Key facts. No citing papers in the map yet (data through 7 Oct 2026). Builds on 27 of its 46 references that are in the map. First posted on arXiv 9 Sep 2026.

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References · 27

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15 more
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  2. 2018Transfer Learning for Brain-Computer Interfaces: A Euclidean Space Data Alignment Approachcited by 76
  3. 2020Transfer Learning for EEG-Based Brain-Computer Interfaces: A Review of Progress Made Since 2016cited by 56
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  5. 2020Federated Transfer Learning for EEG Signal Classificationcited by 36
  6. 2020Transfer Learning for Motor Imagery Based Brain-Computer Interfaces: A Complete Pipelinecited by 31
  7. 2020An Accurate EEGNet-based Motor-Imagery Brain-Computer Interface for Low-Power Edge Computingcited by 15
  8. 2023FedCompass: Efficient Cross-Silo Federated Learning on Heterogeneous Client Devices using a Computing Power Aware Schedulercited by 13
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  10. 2024Federated Motor Imagery Classification for Privacy-Preserving Brain-Computer Interfacescited by 7
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  13. 2025mixEEG: Enhancing EEG Federated Learning for Cross-subject EEG Classification with Tailored mixupcited by 5
  14. 2024CSP-Net: Common Spatial Pattern Empowered Neural Networks for EEG-Based Motor Imagery Classificationcited by 4
  15. 2024On-device Learning of EEGNet-based Network For Wearable Motor Imagery Brain-Computer Interfacecited by 3

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