Clinical neurophysiology provides a range of important investigations to help in the diagnosis and management of patients with neurological disease. These tests fall into two main areas: the study of brain function (electroencephalography (EEG)), and the study of the peripheral nervous system (nerve conduction studies and electromyography (EMG)). These areas have little in common clinically, but are linked by common approach to measurement of small electrical signals, which in turn has led to them being done in the same laboratory with the same technical staff.

The relation between neurology and neurophysiology varies across the world. …