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Evoked responses is an indication of the brain’s responses to specific stimuli. Touch, sound and sight, each stimulates specific parts of the brain. For instance, a flashing light stimulates the brain’s back part, where the visions are perceived. Usually, the brain’s responses to a stimuli are too slight to be picked upon alectroencephalography, but response to a stimuli series may be averaged by computers to reveal that the stimuli were received by the person’s brain. Evoked responses are especially useful if an individual being examined cannot talk. For example, a physician may check a hearing of infant by testing for a brain’s responses after a certain noise. Evoked responses can show slight injury to the nerve to the eye (optic nerve) in the individual, who has multiple sclerosis. In people with epilepsy, evoked responses can reveal deflected electrical discharge triggered by rapid and deep breathing or by watching flashing lights.
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