“Non-stationarities are ubiquitous in EEG signals. They are especially apparent in the use of EEG-based brain-computer interfaces (BCIs): (a) in the differences between the initial calibration measurement and the online operation of a BCI, or (b) caused by changes in the subject’s brain processes during an experiment (e.g. due to fatigue, change of task involvement, etc).”
BCI

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