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The Evoked Potential (EP) is a recording of electrical activity from the brain, spinal nerves, or sensory receptors that occurs in direct response to external stimuli. EP waveforms require sophisticated computer equipment to extract data that will allow physicians to determine the functional state of these pathways. This test is commonly performed by the technologist during surgery on the spine to help the surgeon make sure nerves are not damaged during the operation. Evoked Potentials are also performed in a clinical END laboratory, using either earphones to stimulate the hearing pathway, a checkerboard pattern on a
TV screen to stimulate the visual pathway, or a small electrical current to stimulate a nerve in the arm or leg.
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