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Hierarchical Convolutional Neural Networks for EEG-Based Emotion Recognition

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Abstract

Traditional machine learning methods suffer from severe overfitting in EEG-based emotion reading. In this paper, we use hierarchical convolutional neural network (HCNN) to classify the positive, neutral, and negative emotion states. We organize differential entropy features from different channels as two-dimensional maps to train the HCNNs. This approach maintains information in the spatial topology of electrodes. We use stacked autoencoder (SAE), SVM, and KNN as competing methods. HCNN yields the highest accuracy, and SAE is slightly inferior. Both of them show absolute advantage over traditional shallow models including SVM and KNN. We confirm that the high-frequency wave bands Beta and Gamma are the most suitable bands for emotion reading. We visualize the hidden layers of HCNNs to investigate the feature transformation flow along the hierarchical structure. Benefiting from the strong representational learning capacity in the two-dimensional space, HCNN is efficient in emotion recognition especially on Beta and Gamma waves.

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Funding

This work was supported by the National Natural Science Foundation of China (91520202, 81671651), CAS Scientific Equipment Development Project (YJKYYQ20170050) and Youth Innovation Promotion Association CAS. The authors would also like to thank Prof. Baoliang Lu forproviding the SEED dataset.

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Authors and Affiliations

  1. Research Center for Brain-inspired Intelligence, Institute of Automation, Chinese Academy of Sciences, Beijing, China

    Jinpeng Li, Zhaoxiang Zhang & Huiguang He

  2. University of Chinese Academy of Sciences (UCAS), Beijing, China

    Jinpeng Li, Zhaoxiang Zhang & Huiguang He

  3. Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Beijing, China

    Zhaoxiang Zhang & Huiguang He

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  1. Jinpeng Li
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Correspondence to Huiguang He.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.

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Li, J., Zhang, Z. & He, H. Hierarchical Convolutional Neural Networks for EEG-Based Emotion Recognition. Cogn Comput 10, 368–380 (2018). https://doi.org/10.1007/s12559-017-9533-x

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