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Signal processing and data analysis. (a) Recorded EOG signals depending on eye directions (Left: Reproduced under terms of the CC-BY license [51]. Copyright 2017, the Authors. Published by MDPI, Right: Reproduced with permission [61]. Copyright 2021, Wiley-VCH GmbH). (b) Schematic algorithm diagram using threshold (Reproduced with permission [61]. Copyright 2021, Wiley-VCH GmbH).
