ELDEN Lab - EEG Participant Information

What is EEG?

EEG (electroencephalogram) is the measure of electrical impulses of the nerve cells in the brain emanating to the scalp, detected by metal electrodes on a cap placed on the head (as shown in the image below). Since the electrical activity in the brain becomes weaker as it reaches the scalp and must compete with other electrical signals (e.g., muscle activity, other electrical sources in the area), a conductive gel is injected into each electrode to get a better reading of brain activity related electrical changes. This procedure is not invasive or painful.

EEG data depicts electrical activity in the brain in the form of waves. Muscle movement also produces electrical activity that can interfere with brain data. To minimize the level of electrical activity resulting from muscle movement, you will be asked to sit as still as possible during the experiment, and to release as much tension from your neck and facial muscles as possible (i.e. avoid squinting, excessive blinking, clenching jaw, turning head). The image below provides examples of how eye blinks and muscle tension (e.g., clenched teeth) can distort the brain data.

How to Prepare for the Session

• Please wear comfortable clothes and make sure that your hair is clean and dry (no gel or hair products).
• Please let us know if you have braids in your hair, or a hairstyle that may prevent direct contact with your scalp.
• You will be asked to remove large earrings that may interfere with the placement of the cap.
• If you regularly wear contact lenses, we suggest that you use your glasses for the experiment to minimize blinking and discomfort as a result of prolonged computer screen viewing.
• Please do not chew gum or plan to eat or drink during the experiment; these muscle movements will negatively affect the data.

What to Expect During Your Participation

• An EEG cap will be fitted and placed on your head (as seen in the image on the left); electrodes will be filled with clear conductive gel.
• After completing a general questionnaire, you will complete a simple computerized task in the experiment room (see pic below) while EEG data is monitored and recorded in a separate room. EEG recording will take about 1hr.
• You will be given the opportunity to enjoy refreshments (e.g., snacks, coffee, soda) and take breaks as needed during the recording.
• The conductive gel is clear however it will remain in your hair until it is washed. A separate restroom area is available where you may wash and dry your hair before you leave if you like.
• We provide clean towels, shampoo/conditioner, hair dryer, and a disposable comb for your convenience. You can bring additional hair products with you to apply on your hair (if you like).

Lab Location and Parking

Full address of ELDEN Lab

Tom Barnes Education Center, Room 1057
260 Kilgore Lane
Tuscaloosa, AL 35401

• Google Maps link: View directions
• The lab is in room 1057, first door on the right when you enter from the front door.

Driving to the lab

If you choose to drive to the lab you can park in the parking lot right by Tom Barnes building. After you park, please walk to the lab and obtain a parking pass from a research assistant in the lab to place on your windshield.

Taking the bus

The silver line (Silver 1 & 2) of the Crimson Ride travels directly to the Tom Barnes Education Center. You can access the information for this route at Crimson Ride.

If you have any questions before your scheduled session, please contact us at elden@ua.edu.

Thanks for your participation!