https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0217288 «ECG was recorded via a 64-channel wireless g.Nautilus active electrode multipurpose biosignal acquisition system (g.tec medical engineering GmbH, Austria). The cap-type g.Nautilus was worn by the participants.» Here is an example configuration of a 32 channel EEG NAUTILUS MULTI PURPOSE DEVICE wich costs 54`178,78 Euros: The device used in the above paper was a …