In-service Course For Teachers of Mainstreamed Hearing Impaired Students 27.02.18 Resources – downloadable; also books to borrow etc www.vanasch.school.nz library@vanasch.school.nz PART 1: Audiology & Hearing The ear is made up of the outer ear, middle ear and inner ear. The inner ear has the hearing nerve to the brain Vestibular/ balance system, and the cochlea hair cells. The cochlear hair cells can become damaged by noise. The ear drum sits in the middle ear. Glue ear and sinus occurs mainly in the middle ear. Audiogram NOTE: there is a difference between audibility and intelligibility, i.e. background noise and/or limitations in hearing may mean the student hears the sound/instruction but can’t interpret or understand it. In the classroom, the signal (i.e. instructing voice) must be greater than the background noise. Young children need at least 30dB more signal than background noise before they can process speech. Assistive Devices ...