Evoked responses are particularly useful for the following:
Visual, auditory or tactile stimuli can be used to excite corresponding cortical areas and to induce a focal cortical electrical activity. Normally these little potential in the background noise of the EEG would be lost. But by attractive coupled, computer based averaging (averaging) of EEG-sections, the background noise removed, and a response wave are displayed. Latency, duration and amplitude of the evoked potentials demonstrate whether the tested sensory pathway is intact. Evoked responses are particularly useful for the following: Recognize clinically healthy deficits at a demyelinating disease appraising sensory systems in infants causative deficits, which are suspected to be theatrical Following the subclinical disease process Visual evoked potentials such. B. demonstrate an unexpected damage to the optic nerve by multiple sclerosis. When an injury to the brain stem is eligible, auditory brainstem potentials can provide objective evidence. Somatosensory evoked potentials can display the localization of a malfunction, if a structural change (eg. As metastatic carcinoma, plexus and spinal cord infiltrated) several CNS levels impaired. Somatosensory evoked potentials and the prognosis can in coma patients, particularly with hypothermia, support when the usual clinical indicators are unclear.