Improving Generalization of Motor-Imagery Brainwave Decoding via Dynamic Convolutions

Konstantinos Barmpas, Yannis Panagakis, Stylianos Bakas, Dimitrios Adamos, Nikolaos Laskaris, Stefanos Zafeiriou

Keywords: Brain-Computer Interfaces, Dynamic Convolution, Causality

TL;DR: Tackling inter-subject variability using dynamic convolutions and causal reasoning

Abstract: Deep Convolutional Neural Networks (CNNs) have recently demonstrated impressive results in electroencephalogram (EEG) decoding for several Brain-Computer Interfaces (BCI) paradigms, including Motor-Imagery (MI). However, neurophysiological processes underpinning EEG signals vary across subjects causing covariate shifts in data distributions and hence hindering the generalization of deep models across subjects. In this paper, we aim to address the challenge of inter-subject variability in MI. To this end, we employ causal reasoning to characterize all possible distribution shifts in the MI task and propose a dynamic convolution framework to account for shifts caused by the inter-subject variability. Using publicly available MI datasets, we demonstrate improved generalization performance across subjects in various MI tasks for four well-established deep architectures.

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