MRieHy Framework for Online MI-BCI Adaptation
Researchers propose MRieHy, a multi-feature Riemannian hypergraph framework for online test-time adaptation of motor imagery BCI decoding. It aligns multi-day distributions via Riemannian means of covariance matrices, builds one hypergraph with Riemannian distance and a second with cosine similarity, fuses them with adaptively learned weights, and decodes buffered online samples after Riemannian alignment. On a private four-class ECoG dataset and two public four-class EEG datasets, MRieHy shows notable gains over state-of-the-art baselines, targeting the cross-day transferability and online operation that clinical MI-BCI still lacks.
Why it matters
Cross-day drift is a persistent barrier to clinical MI-BCI; MRieHy blends Riemannian geometry with hypergraph structure for a testable fix, and its public-dataset validation makes the claim easy to check.