Electroencephalography (EEG) is a technique used to measure changes in electrical activity on the scalp . As the brain works, tiny changes in electrical charge result and can be measured from the scalp (Muscle movement and eye blinks also create scalp electrical activity). To measure this activity, participants wear a stretchy net-like cap with many embedded sensors. Each sensory is attached to a sponge, which rests softly on the scalp. These sensors passively record naturally occurring changes in electrical acidity as participants do our experiments. Our sensor nets are specifically designed to go on very quickly and comfortably without much adjustment so we can accommodate participants of all ages.
For a detailed description of the biological and mathematical details of this technique please read here.