In conclusion, this chapter provides an overview of the different types of normal EEG activity and benign variants that are seen in the EEG. One needs to be aware of the normal variability at different ages and different states of wakefulness, drowsiness, and sleep. Dr. Klass has stated that the “detection and interpretation of the EEG data derived from visual analysis involve matters of judgment and experience, which render clinical EEG an art as much as a science.”5