Network features of simultaneous EEG and fMRI predict working memory load

Yutong Wang; Ying Liu; Li Yao; Xiaojie Zhao

doi:10.1117/12.2548415

16 March 2020 Network features of simultaneous EEG and fMRI predict working memory load

Yutong Wang, Ying Liu, Li Yao, Xiaojie Zhao

Proceedings Volume 11313, Medical Imaging 2020: Image Processing; 113131U (2020) https://doi.org/10.1117/12.2548415
Event: SPIE Medical Imaging, 2020, Houston, Texas, United States

Abstract

The identification of mental load has important practical significance for human life. In recent years, studies have used physiological signals of different modalities to measure mental load. However, there is no single indicator that can fully assess mental load, and the fusion of multimodal signals to measure this variable is still controversial. The emergence of simultaneous EEG and fMRI enables researchers to explore brain function, especially working memory, with high temporal and spatial resolution. In this study, we fused EEG and fMRI data on network features to estimate working memory load. By introducing a filter bank, the phase synchronization values covering the full frequency band were extracted as the EEG network features. Then, we proposed the Wasserstein distance to measure functional connectivity in single-trial fMRI data. Finally, Fisher vector was used to fuse these features from the above two modalities, and this method was compared with the direct splicing features. The results showed that the Fisher vector was more effective for recognition than direct splicing was, providing a new option for multimodality feature fusion. In addition, distance-based functional connectivity extraction on the individual level enriches the range of tools with which to study brain network.

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Yutong Wang, Ying Liu, Li Yao, and Xiaojie Zhao "Network features of simultaneous EEG and fMRI predict working memory load", Proc. SPIE 11313, Medical Imaging 2020: Image Processing, 113131U (16 March 2020); https://doi.org/10.1117/12.2548415

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KEYWORDS

Electroencephalography

Functional magnetic resonance imaging

Feature extraction

Electrodes

Brain

Fusion splicing

Cognitive neuroscience

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