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Hi Coen, Thanks for your reply. We found out what caused the artifact: right after importing the data, the script we used rereferences the data to average reference. This introduced the squarewave signal from the response channel (ERG1) to all other channels. The reason we did't think of this earlie...

Hi Coen, Thanks for your reply. We since looked further into this issue, and it seems that the responsebox produces a spike-like artifact at the time of both the button press and release. The original image I posted was after lp, hp and notch filtering as well as downsampling of the data, all of whi...

Hi all, We encountered a strange issue with our Active 2 system. When using the Biosemi response box, there is a huge low frequency artifact/ drift whenever the button is pressed. We tried 2 differend responseboxes, both produce the artifact (please find a figure attached -note the large scaling on ...