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n 1978, at the University of London, the Physicist David T. Kemp made an unusual discovery. Kemp noticed that faint sounds, known as Otoacoustic emissions (OAEs), revealed the existence of the cochlear amplifier, a mechanism responsible for sound sensitivity and frequency resolution. This discovery proved that the ear is an active rather than passive organ. Following this discovery the experimental music world embraced these findings by incorporating them into sound works.