However, when a child has auditory neuropathy spectrum disorder, the auditory brainstem response will not match the level at which the child responds to sounds. Usually the auditory brainstem response will closely match the levels at which a child responds to sound. This means that although the ear is picking up sound correctly, the hair cells within the cochlea or the hearing nerve itself may not be passing the sound on to the brain correctly. What does it mean if the tests show the cochlea's hair cells are working normally but the auditory brainstem response is not normal? These tests measure how well parts of the hearing system are working but they do not directly measure hearing itself. All of these tests are harmless and painless. A cochlea microphonic (CM) test also shows evidence of how the cochlea's hair cells are working. An 'auditory brainstem response' (ABR) measures the function of the auditory nerve and its connections in the lower part of the brain. What tests are used to diagnose auditory neuropathy spectrum disorder?Īn 'otoacoustic emissions' (OAE) test shows whether the outer hair cells of the cochlea are responding normally. The number of children affected by this condition is not yet fully known, but it is estimated that up to one in 10 profoundly deaf children have this condition. This means that the child may be hearing something, but this is probably very distorted. What is auditory neuropathy spectrum disorder (ANSD)Īuditory neuropathy spectrum disorder (sometimes called auditory neuropathy or auditory dys-synchrony) are terms used to describe a particular type of hearing problem when sounds may be transmitted normally through the middle ear and the cochlea but then do not transmit normally from the cochlea, or along the auditory nerve. Hearing loss can be described as mild, moderate, severe or profound, depending on the level of the quietest sound a child can hear. By combining the results of different hearing tests it is possible to find out which part of the hearing system is faulty. Sometimes a mixture of both conductive and sensorineural hearing loss can occur together. A sensorineural hearing loss occurs when the inner ear (the cochlea or hearing nerve) is not working as well as it should.A conductive hearing loss occurs when sound cannot pass from the outer ear to the inner ear (the cochlea and hearing nerve) due to a blockage or fault that prevents sound waves from moving through the ear.Hearing loss commonly falls into two categories - conductive or sensorineural. Hearing loss occurs when some part of the hearing system is not working as it should. Why does my child have auditory neuropathy spectrum disorder?.Will my child be able to learn to speak?.
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