Abstract
The brain-computer interface (BCI) interprets the physiological information of the human brain in the process of consciousness activity. It builds a direct information transmission channel between the brain and the outside world. As the most common non-invasive BCI modality, electroencephalogram (EEG) plays an important role in the emotion recognition of BCI; however, due to the individual variability and non-stationary of EEG signals, the construction of EEG-based emotion classifiers for different subjects, different sessions, and different devices is an important research direction. Domain adaptation utilizes data or knowledge from more than one domain and focuses on transferring knowledge from the source domain (SD) to the target domain (TD), in which the EEG data may be collected from different subjects, sessions, or devices. In this study, a new domain adaptation sparse representation classifier (DASRC) is proposed to address the cross-domain EEG-based emotion classification. To reduce the differences in domain distribution, the local information preserved criterion is exploited to project the samples from SD and TD into a shared subspace. A common domain-invariant dictionary is learned in the projection subspace so that an inherent connection can be built between SD and TD. In addition, both principal component analysis (PCA) and Fisher criteria are exploited to promote the recognition ability of the learned dictionary. Besides, an optimization method is proposed to alternatively update the subspace and dictionary learning. The comparison of CSFDDL shows the feasibility and competitive performance for cross-subject and cross-dataset EEG-based emotion classification problems.
Highlights
Emotion is the attitude experience and corresponding behavior response of human beings to objective things, which has an important influence on human behavior and mental health
Experiments on SJTU emotion EEG dataset (SEED) (Zheng and Lu, 2015) and dataset for emotion analysis using EEG, physiological and video signals (DEAP) (Koelstra et al, 2011) demonstrate that dictionary learning in subspace is effective and domain adaptation sparse representation classifier (DASRC) outperforms the advanced methods in cross-subject and cross-dataset scenarios
The local information preserved criterion is exploited to project samples in source domain (SD) and target domain (TD) into the shared subspace, where both principal component analysis (PCA) and Fisher criteria are exploited to transform discriminative knowledge through the shared dictionary
Summary
Emotion is the attitude experience and corresponding behavior response of human beings to objective things, which has an important influence on human behavior and mental health. These classification methods are based on the assumption that training and test data are independently and identically distributed This assumption is often difficult to hold for BCI, because EEG signals have nonstationary characteristics, and the performance of the classifier fluctuates significantly between subjects and datasets. We propose a domain adaptation sparse representation classifier (DASRC) to address the EEG-based emotion classification in cross-subject and cross-dataset scenarios. Experiments on SJTU emotion EEG dataset (SEED) (Zheng and Lu, 2015) and dataset for emotion analysis using EEG, physiological and video signals (DEAP) (Koelstra et al, 2011) demonstrate that dictionary learning in subspace is effective and DASRC outperforms the advanced methods in cross-subject and cross-dataset scenarios
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