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Hi all, We have been having a similar problem as well. We're using a 128 cap. In about 1/10 of subjects, we would see a lot of drift in all the electrodes, especially the frontal ones. Whenever subjects beginning responding to button presses, the drifts will begin. This drift is not seen during rest...

[quote="Coen"]60 Hz mains interference ? Bundle the electrode cables Best regards, Coen[/quote] Hi Coen, Our lab has recently encountered the same problem with 60Hz waves (as pictured by devinomega). If I select "none" for reference in ActView the 60Hz waves are present in every electrode in every r...