Single-trial-based temporal principal component analysis on extracting event-related potentials of interest for an individual subject
Zhang, G., Li, X., Lu, Y., Tiihonen, T., Chang, Z., & Cong, F. (2023). Single-trial-based temporal principal component analysis on extracting event-related potentials of interest for an individual subject. Journal of neuroscience methods, 385, Article 109768. https://doi.org/10.1016/j.jneumeth.2022.109768
Published inJournal of neuroscience methods
DisciplineTekniikkaLaskennallinen tiedeTietotekniikkaSecure Communications Engineering and Signal ProcessingEngineeringComputational ScienceMathematical Information TechnologySecure Communications Engineering and Signal Processing
© 2022 University of Jyvaskyla. Published by Elsevier B.V.
Background: Temporal principal component analysis (tPCA) has been widely used to extract event-related potentials (ERPs) at group level of multiple subjects ERP data and it assumes that the underlying factor loading is fixed across participants. However, such assumption may fail to work if latency and phase for one ERP vary considerably across participants. Furthermore, effect of number of trials on tPCA decomposition has not been systematically examined as well, especially for within-subject PCA. New method: We reanalyzed a real ERP data of an emotional experiment using tPCA to extract N2 and P2 from single-trial EEG of an individual. We also explored influence of the number of trials (consecutively increased from 10 to 42 trials) on PCA decomposition by comparing temporal correlation, the statistical result, Cronbach’s alpha, spatial correlation of both N2 and P2 for the proposed method with the conventional time-domain analysis, trial-averaged group PCA, and single-trial-based group PCA. Results: The results of the proposed method can enhance spatial and temporal consistency. We could obtain stable N2 with few trials (about 20) for the proposed method, but, for P2, approximately 30 trials were needed for all methods. Comparison with Existing Method(s): About 30 trials for N2 were required and the reconstructed P2 and N2 were poor correlated across participants for the other three methods. Conclusion: The proposed approach may efficiently capture variability of one ERP from an individual that cannot be extracted by group PCA analysis. ...
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Additional information about fundingThis work was supported by National Natural Science Foundation of China (Grant No. 91748105), National Foundation in China (No. JCKY2019110B009 & 2020-JCJQ-JJ-252) and the Fundamental Research Funds for the Central Universities in Dalian University of Technology in China [DUT20LAB303 & DUT20LAB308], and the scholarships from China Scholarship Council (No. 201806060165). This study is to memorize Prof. Tapani Ristaniemi for his great help to Guanghui Zhang, Fengyu Cong and the other authors. Open access funding provided by University of Jyväskylä (JYU). ...
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