A complex hearing test designed to record the electrical activity of the cochlea, a part of the inner ear. This test is commonly done to diagnose a condition called Meniere's Disease. The ECOG is performed by placing an electrode that consists of a wire, wick or spring, or a sponge into the ear canal as close as possible to the cochlea. The ear is then stimulated with alternating clicks of different polarities, or tone bursts. These tone bursts are transformed into vibrations in the middle ear, your ear does this naturally and automatically all the time. The vibrations are turned into electrical impulses in the inner ear and are recorded and measured using computer software.