Talk · International Conference on Electronics, Computer and Computation · April 10, 2026

Establishing a Reliable FBCSP Baseline for Robust BCI Systems

Айгерим Айтим, Zhuldyz Bagybek

Abstract

Filter Bank Common Spatial Patterns (FBCSP) is widely used as a classical baseline in motor imagery BCI research. Despite its popularity, many published implementations suffer from methodological shortcomings that limit both reproducibility and practical relevance. Typical issues include information leakage caused by feature selection on the full dataset, superficial use of ICA without consistent artifact removal, and evaluation protocols that ignore class imbalance or subject variability. In this work, we present a fully reproducible FBCSP pipeline designed to address these limitations. The approach employs nested stratified cross-validation to ensure unbiased performance estimation, integrates ICA with automatic component rejection to improve signal quality, and reports results using chance-corrected metrics such as Cohen's Kappa. All processing steps are explicitly defined and implemented using standard, open-source tools. Evaluation on the BCI Competition IV-2a dataset demonstrates a mean classification accuracy of 81.8 percent, corresponding to a Cohen's Kappa of 0.757. This represents an improvement of 7.5 percentage points over the original FBCSP baseline. The proposed pipeline provides a robust and transparent reference point for future studies, particularly in neurorehabilitationoriented BCI system development, and all code is released publicly to support independent verification and reuse.

EEG and Brain-Computer InterfacesMuscle activation and electromyography studiesStroke Rehabilitation and Recoveryfilter bank common spatial patternmotor imagerybrain-computer interface

Establishing a Reliable FBCSP Baseline for Robust BCI Systems

Abstract

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