Self-supervised Group Meiosis Contrastive Learning for EEG-Based Emotion Recognition

• URL: http://arxiv.org/abs/2208.00877v2
• Date: Tue, 2 Aug 2022 11:29:23 GMT
• Title: Self-supervised Group Meiosis Contrastive Learning for EEG-Based Emotion Recognition
• Authors: Haoning Kan, Jiale Yu, Jiajin Huang, Zihe Liu, Haiyan Zhou
• Abstract summary: How to recognize emotions with limited labels has become a new research and application bottleneck. This paper proposes a Self-supervised Group Meiosis Contrastive learning framework based on the stimuli consistent EEG signals in human being.
• Score: 4.763573596218676
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The progress of EEG-based emotion recognition has received widespread attention from the fields of human-machine interactions and cognitive science in recent years. However, how to recognize emotions with limited labels has become a new research and application bottleneck. To address the issue, this paper proposes a Self-supervised Group Meiosis Contrastive learning framework (SGMC) based on the stimuli consistent EEG signals in human being. In the SGMC, a novel genetics-inspired data augmentation method, named Meiosis, is developed. It takes advantage of the alignment of stimuli among the EEG samples in a group for generating augmented groups by pairing, cross exchanging, and separating. And the model adopts a group projector to extract group-level feature representations from group EEG samples triggered by the same emotion video stimuli. Then contrastive learning is employed to maximize the similarity of group-level representations of augmented groups with the same stimuli. The SGMC achieves the state-of-the-art emotion recognition results on the publicly available DEAP dataset with an accuracy of 94.72% and 95.68% in valence and arousal dimensions, and also reaches competitive performance on the public SEED dataset with an accuracy of 94.04%. It is worthy of noting that the SGMC shows significant performance even when using limited labels. Moreover, the results of feature visualization suggest that the model might have learned video-level emotion-related feature representations to improve emotion recognition. And the effects of group size are further evaluated in the hyper parametric analysis. Finally, a control experiment and ablation study are carried out to examine the rationality of architecture. The code is provided publicly online.

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