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Decoding motor imagery based on dipole feature imaging and a hybrid CNN with embedded squeeze-and-excitation block

Wang Linlin, Li Mingai

Biocybernetics and Biomedical Engineering

2023

Vol. 43, no. 4

751--762

Motor imagery (MI) decoding is the core of an intelligent rehabilitation system in brain computer interface, and it has a potential advantage by using source signals, which have higher spatial resolution and the same time resolution compared to scalp electroencephalography (EEG). However, how to delve and utilize the personalized frequency characteristic of dipoles for improving decoding performance has not been paid sufficient attention. In this paper, a novel dipole feature imaging (DFI) and a hybrid convolutional neural network (HCNN) with an embedded squeeze-and-excitation block (SEB), denoted as DFI-HCNN, are proposed for decoding MI tasks. EEG source imaging technique is used for brain source estimation, and each sub-band spectrum powers of all dipoles are calculated through frequency analysis and band division. Then, the 3D space information of dipoles is retrieved, and by using azimuthal equidistant projection algorithm it is transformed to a 2D plane, which is combined with nearest neighbor interpolation to generate multi sub-band dipole feature images. Furthermore, a HCNN is designed and applied to the ensemble of sub-band dipole feature images, from which the importance of sub-bands is acquired to adjust the corresponding attentions adaptively by SEB. Ten-fold cross-validation experiments on two public datasets achieve the comparatively higher decoding accuracies of 84.23% and 92.62%, respectively. The experiment results show that DFI is an effective feature representation, and HCNN with an embedded SEB can enhance the useful frequency information of dipoles for improving MI decoding.

Review of solutions for the application of example of machine learning methods for Motor Imagery in correlation with Brain-Computer Interfaces

Paszkiel Szczepan, Rojek Ryszard, Lei Ningrong, Castro Maria Antonio

Przegląd Elektrotechniczny

2021

R. 97, nr 11

111--116

Presently, numerous public databases presenting the collected EEG signals, including the ones in the scope of Motor Imagery (MI), are available. Simultaneously, machine-learning methods, which enable effective and fast discovering of information, also in the sets of biomedical data, are constantly being developed. In this paper, a set of 30 of some of the latest scientific publications from the years 2016-2021 has been analyzed. The analysis covered, among others: public data repositories in the form of EEG signals as input data; numbers and types of the analyzed tasks in the scope of MI in the above-mentioned databases; and Deep Learning (DL) architectures.

Obecnie dostępne są liczne ogólnodostępne bazy danych prezentujące zebrane sygnały EEG, w tym z zakresu obrazowania motorycznego (MI). Jednocześnie stale rozwijane są metody uczenia maszynowego, które umożliwiają efektywne i szybkie odkrywanie informacji, także w zbiorach danych biomedycznych. W niniejszym artyule przeanalizowano zestaw 30 spośród najnowszych publikacji naukowych z lat 2016- 2021. Analizie poddano m.in.: publiczne repozytoria danych w postaci sygnałów EEG jako dane wejściowe; liczby i rodzaje analizowanych zadań z zakresu obrazowania motorycznego w ww. bazach; i architektury Deep Learning (DL).