• The study is performed by placing electrodes
each approximately the size of a pea on the scalp and affixing them
with some type of adhesive (usually paste or glue).
• Most commonly, 21 electrodes are affixed.
• The electrodes are connected to the EEG machine by thin wires
usually pulled together into a “ponytail.”
• The patient may be asked to perform certain “maneuvers” that
may bring out EEG abnormalities.
• Intermittently closing his or her eyes.
• Watching flashing strobe lights.
• Hyperventilating for 2–3 minutes.
• Sleep is often important to capture as well, and parents may
be asked to keep their child awake on the night before the study.
• A routine outpatient EEG usually is performed for approximately
45–60 minutes but longer studies may be required.
• After the EEG is complete, the electrodes can be easily removed
after the EEG machine is turned off.