As much as possible, move (part) the hair away from the electrode area to ensure the electrode makes contact with the scalp.
Gently abrade skin at the electrode sites.
Apply a drop of gel to the electrode.
Apply pressure to the electrodes for about 1 minute after the initial placement.
Subject must remain still. Blinking and other movement will affect the recording of all four rhythms.
Despite your best efforts, electrode adhesion may not be strong enough to record data; try another Subject or different electrode placement.