 Frey experimented with nerve-deaf subjects, and speculated that the human detecting mechanism was in the cochlea, but at the time of the experiment the results were inconclusive due to factors such as tinnitus.Auditory sensations of clicking or buzzing have been reported by some workers at modern day microwave transmitting sites that emit pulsed microwave radiation.Auditory response to transmitted frequencies from approximately 200 MHz to at least 3 GHz has been reported.