arXiv AI By Xuan-The Tran, Thien-Nhan Vo, Son-Tung Vu, Thoa-Thi Tran, Manh-Dat Nguyen, Thomas Do, Chin-Teng Lin

Inter- and Intra-Subject Variability in EEG: A Systematic Survey

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The article reviews how inter- and intra-subject variability in EEG affects reliability and reproducibility across resting-state, ERP, and task-related/BCI paradigms. It finds that inter-subject differences are generally larger than within-subject fluctuations, with stability varying by feature—alpha-band measures are more reliable than higher-frequency or connectivity metrics, and P300 components show moderate-to-good reliability. The review catalogs biological, state-related, technical, and analytical sources of variability, discusses quantification methods such as ICC, CV, SNR, and generalizability theory, and offers design and reporting recommendations to manage and leverage variability for precision neuroscience and robust neurotechnology.

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