During an EEG, the electrical signals of the brain are recorded. This electrical activity is detected by electrodes, or sensors, placed on the patient's scalp and transmitted to a polygraph that records the activity.
Mardi Gras Beads or throws are a fun part of the Carnival festivities in New Orleans, Louisiana.
The customs surrounding Mardi Gras are fascinating and fun, and one of the most recognizable symbols of this celebration are Mardi Gras masks. The practice of masking dates back to the European celebration of Carnival, and some think it has its roots much farther back in the celebration customs of pagan Rome. Mardi Gras masks lend an air of mystery and magic to the revelry.