evoked potentials (EP)
Evoked Potentials (EP): The evoked potential measures how long it takes an impulse to travel from a point of stimulation to the brain, to determine if a problem is in the peripheral or central nervous system. Electrodes are applied to the scalp, a stimulus is given to one of the sensory pathways, and brain waves are recorded and averaged, then measured. The test doesn't hurt, but may seem very repetitive. Testing takes approximately 1/2 to 1 1/2 hours to perform. Eat and take medications as you normally would, and have clean skin and hair. Do not use any lotions.