EEG Blue Discs (BlueTrodes)The EEG Disc Electrodes are used with our EXG Sensor mainly for EEG neurofeedback applications. The EEG Disc Electrodes are "snapped" into the NeXus EXG sensor. Electrogel or Nuprep and 1020 can be used for preparation. Attach the electrodes to the patient's ears by using our EXG Ear Clips. You could also use the EEG Fast Fix Cap to position the electrodes on the Mastoids. The EEG Disc Electrodes include gel pads which make them suitable for EMG