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Tinnitus-the perception of sound in the absence of an actual external sound-represents a symptom of an underlying condition rather than a single disease. Several theories have been proposed to explain the mechanisms underlying tinnitus. Tinnitus generators are theoretically located in the auditory pathway, and such generators and various mechanisms occurring in the peripheral auditory system have been explained in terms of spontaneous otoacoustic emissions, edge theory, and discordant theory.doi:10.3988/jcn.2009.5.1.11 pmid:19513328 pmcid:PMC2686891 fatcat:fqklp5foafdsxbtpf5nigfwn6y