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Brain stem auditory evoked responses (BAERs) are electrical potentials that are produced in response to an auditory stimulus and are recorded from disk electrodes attached to the scalp. Depending on the amount of time elapsed between the "click" stimulus and the auditory evoked response, potentials are classified as early (0 to 10 msec), middle (11 to 50 msec), or late (51 to 500 msec). The early potentials reflect electrical activity at the cochlea, 8th cranial nerve, and brain stem levels; the latter potentials reflect cortical activity.