 Electrodiagnostic medicine focuses only on the peripheral nervous system and not the central nervous system.Whereas a clinical neurophysiologist is trained to perform all the following studies EEG, intraoperative monitoring, nerve conduction studies, EMG and evoked potentials, and electrodiagnostic physician focuses mainly on nerve conduction studies, needle EMG, and evoked potentials.The American Board of Psychiatry and Neurology provides certification examination in clinical neurophysiology.