There are five best - known potentials , what are they ?
Sensory evoked potentials ( SEP ) , are recorded from the central nervous system following stimulation of sense organs ( for example , visual evoked potentials elicited by a flashing light or changing pattern on a monitor ; auditory evoked potentials by a click or tone stimulus presented through earphones ) or by tactile or somatosensory evoked potential ( SSEP ) elicited by tactile or electrical stimulation of a sensory or mixed nerve in the periphery .