MSDA-Net: Multi-source Domain Adaptive Network for Multi-modal Emotion Recognition

Electroencephalogram (EEG) has shown g reat potential in multi-modal emotion recognition (MER) due to its ability to directly capture emotional states. However, the nonstationarity of EEG signals leads to significant variations across subjects and sessions, posing challenges for subject-independent MER. While previous methods have made significant progress, they often fail to integrate multimodal signals into transfer learning frameworks effectively. To address this limitation, we propose a Multi-source Domain Adaptive Network (MSDA-Net) for MER, designed to mitigate cross-subject and cross-session distribution shifts and enhance recognition performance. Specifically, we first design a feature alignment module to integrate features from different modalities, generating cross-modal feature representations and extracting representative shared features. To further improve generalization, we incorporate domain-specific feature extractors to capture domain-invariant emotional representations. Additionally, we introduce an adapter module to adjust the feature representations between different modalities, aiming to capture inter-individual differences and cross-modal correlations better. Finally, we unify classification loss, discrepancy loss, and maximum mean discrepancy (MMD) loss into a joint optimization framework. Abundant experiments on the SEED and SEED-IV datasets demonstrate the superiority of MSDA-Net, highlighting its effectiveness in improving MER performance.