An electroencephalogram (EEG) is a test used to find problems related to electrical activity of the brain. An EEG tracks and records brain wave patterns. Small metal discs with thin wires (electrodes) are placed on the scalp, and then send signals to a computer to record the results Most EEGs are done to diagnose and monitor seizure disorders ( such as epilepsy), head injury, encephalitis (inflammation of the brain), brain tumour, encephalopathy (disease that causes brain dysfunction), memory problems, sleep disorders, stroke, dementia. Nerve conduction velocity test (NCV): Nerve conduction velocity (NCV) test also called as nerve conduction study (NCS). Nerve conduction velocity (NCV) test is an electrical test that is used to determine the adequacy of conduction of the nerve impulse as it courses down a nerve. This test is used to detect signs of nerve injury. Nerve conduction velocity NCV) is used for numbness, tingling, burning sensations, peripheral neuropathy, carpel tunnel syndrome and other compression neuropathies.