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a) Conductive hearing loss: testing with ear and bone loudspeakers. The cause lies in the external or middle ear. Pure-tone audiometry reveals a difference between the air conduction (x-x-x) and bone conduction (<-<-<) thresholds.
b) Sensorineural hearing loss: testing with ear and bone loudspeakers. The cause lies in the cochlea. Pure-tone audiometry reveals superposable air and bone conduction curves.
