The sampling rate is usually expressed in Hz, for example 240 Hz is 240 times per second. The minimum acceptable sampling rate is 2.5 times greater than the highest frequency of interest but most digital EEG systems will sample at 240 Hz: https://www.ebme.co.uk/articles/clinical-engineering/introduction-to-eeg The OpenBCI EEG headset which was tested in this paper: had a …
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