Multimodal Coherence-Correlation Fusion of EEG and ECoG Signals for Enhanced Epileptic Seizure Detection Using Discrete Lyapunov Wavelet Transform

Epileptic seizure detection using multimodal neural signals has the potential to improve diagnostic reliability compared to unimodal approaches. In this work, we present a signal-processing-driven framework that integrates scalp EEG and intracranial ECoG signals using Dynamic Exponential Log Time Warping (DELTW) for temporal alignment and a robust artifact suppression method, Skewness Independent Percentile Kurtosis Analysis (SIPKA). The aligned multimodal signals are decomposed using a Discrete Lyapunov Exponents Wavelet Transform (DLEWT) to extract nonlinear dynamical features associated with seizure activity. The proposed method was evaluated on the CHB-MIT EEG and OpenNeuro ECoG datasets. Compared to baseline methods, the DELTW-aligned fusion achieved an accuracy of 96.1%, an AUC of 0.92, and an AUC-PR of 0.90 while reducing the false alarm rate to 0.17 h⁻¹ and the mean detection latency to 4.6 s. Statistical significance testing (Wilcoxon signed-rank test) confirmed that these improvements were significant ( p < 0.01 ). These results demonstrate that combining DELTW-based alignment, SIPKA artifact rejection, and DLEWT-based nonlinear features can substantially enhance seizure detection accuracy and reduce false alarms without requiring deep learning models, offering a computationally efficient solution suitable for clinical deployment.