- Participant will have an EEG to measure the electrical activity of participant's brain. During the EEG, researchers will place a cap containing 19 electrodes on participant's scalp and 1 electrode on each earlobe. The electrodes will measure and record participant's brain wave activity, similar to the way a doctor listens to participant's heartbeat from the surface of participant's skin. The EEG should take about 45 minutes to complete.