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Human Cortical Physiology Unit, Human Motor Control Section, National Institute of Neurological Disorders and Stroke, Bethesda, MD (Drs. Pascual-Leone, Cohen, Wassermann, Brasil-Neto, Valls-Solé, and Hallett, and Ms. Dang)
Clinical Audiology Unit, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD (Dr. Shotland and Ms. Pikus).
Prompted by the description of hearing loss in rabbits exposed to the acoustic artifact of magnetic stimulation, we compared the results of audiologic studies before and after exposure to transcranial magnetic stimulation in humans. We found no evidence of temporary or permanent threshold shifts in any of the subjects, even in those exposed to transcranial magnetic stimulation repeatedly for several years. Risk of hearing loss from the acoustic artifact of magnetic stimulation, as evaluated by audiograms, tympanograms, acoustic reflexes, and auditory evoked potentials, seems to be small in humans.
Address correspondence and reprint requests to Dr. Mark Hallett, NINDS, NIH, Building 10, Room 5N226, Bethesda, MD 20892.
Received March 13, 1991. Accepted for publication in final form August 29, 1991.
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