FRIST: FMRI Representation Informed Shared-space Training Improves EEG-only Individual-Finger BCI Decoding

arXiv cs.LG Papers

Summary

FRIST is a two-stage EEG decoding framework that leverages fMRI data to improve EEG-only individual-finger BCI decoding, demonstrating increased accuracy in movement execution and motor imagery tasks.

arXiv:2609.12298v1 Announce Type: new Abstract: Finger-level motor decoding is important for naturalistic brain-computer interface (BCI) control, yet individual-finger decoding from scalp electroencephalography (EEG) remains challenging because finger representations are spatially close in the sensorimotor cortex and blurred by volume conduction. Leveraging the high spatial resolution of functional MRI (fMRI), we introduce fMRI Representation-Informed Shared-Space Training (FRIST), a two-stage EEG decoding framework that first learns fMRI-informed spectral projections from simultaneous EEG-fMRI recordings and then uses fMRI-derived class geometry to guide residual refinement of EEG predictions. FRIST transfers information across recordings through shared finger labels without requiring paired trials and uses only EEG at inference. We evaluated 12 able-bodied participants during movement execution (ME) and motor imagery (MI) under two-class and three-class chronological session-held-out decoding simulating the online scenario. Using EEGNet as the EEG feature extractor, FRIST increased group average accuracy from 66.93% to 74.53% for two-class ME, from 44.83% to 56.58% for three-class ME, from 80.78% to 85.63% for two-class MI, and from 60.93% to 69.90% for three-class MI compared with the EEG-only EEGNet baseline. FRIST is also shown to improve EEG-only decoding when the target participant's own fMRI data were unavailable. FRIST also generalized across multiple EEG decoding backbones, reaching 87.40% in two-class MI and 72.54% in three-class MI with EEG Conformer as the EEG feature extractor. These findings indicate that fMRI provide useful spatial constraints for EEG representation learning. FRIST improves noninvasive EEG-based finger-level BCI decoding, offering a multimodal strategy for integrating the spatial specificity of fMRI with real-time applicability of EEG.
Original Article
View Cached Full Text

Cached at: 09/14/26, 08:40 AM

# FRIST: FMRI Representation Informed Shared-space Training Improves EEG-only Individual-Finger BCI Decoding
Source: [https://arxiv.org/abs/2609.12298](https://arxiv.org/abs/2609.12298)
[View PDF](https://arxiv.org/pdf/2609.12298)

> Abstract:Finger\-level motor decoding is important for naturalistic brain\-computer interface \(BCI\) control, yet individual\-finger decoding from scalp electroencephalography \(EEG\) remains challenging because finger representations are spatially close in the sensorimotor cortex and blurred by volume conduction\. Leveraging the high spatial resolution of functional MRI \(fMRI\), we introduce fMRI Representation\-Informed Shared\-Space Training \(FRIST\), a two\-stage EEG decoding framework that first learns fMRI\-informed spectral projections from simultaneous EEG\-fMRI recordings and then uses fMRI\-derived class geometry to guide residual refinement of EEG predictions\. FRIST transfers information across recordings through shared finger labels without requiring paired trials and uses only EEG at inference\. We evaluated 12 able\-bodied participants during movement execution \(ME\) and motor imagery \(MI\) under two\-class and three\-class chronological session\-held\-out decoding simulating the online scenario\. Using EEGNet as the EEG feature extractor, FRIST increased group average accuracy from 66\.93% to 74\.53% for two\-class ME, from 44\.83% to 56\.58% for three\-class ME, from 80\.78% to 85\.63% for two\-class MI, and from 60\.93% to 69\.90% for three\-class MI compared with the EEG\-only EEGNet baseline\. FRIST is also shown to improve EEG\-only decoding when the target participant's own fMRI data were unavailable\. FRIST also generalized across multiple EEG decoding backbones, reaching 87\.40% in two\-class MI and 72\.54% in three\-class MI with EEG Conformer as the EEG feature extractor\. These findings indicate that fMRI provide useful spatial constraints for EEG representation learning\. FRIST improves noninvasive EEG\-based finger\-level BCI decoding, offering a multimodal strategy for integrating the spatial specificity of fMRI with real\-time applicability of EEG\.

## Submission history

From: Yidan Ding \[[view email](https://arxiv.org/show-email/da7300b5/2609.12298)\] **\[v1\]**Fri, 11 Sep 2026 00:00:08 UTC \(5,076 KB\)

Similar Articles

MEL: Coordinate-Preserving EEG Tokenization for fMRI Translation

arXiv cs.LG

This paper introduces MEL, a coordinate-preserving EEG tokenization framework for translating EEG to fMRI, addressing representation-interface mismatch and improving prediction over baselines through explicit modeling of hemodynamic latency and spectral-spatial dynamics.