This test helps us to detect the subclinical (abnormality without symptoms)
Involvement of central nervous system.
It is of 3 types.
1. Visual evoked potential : We detect the abnormality in visual pathway especially
2. Brainstem Auditory Evoked Potential: In this we detect the abnormality in auditory pathway from ear to brainstem.
3. Somato sensory evoked potential: In this we detect the sensory involvement of