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Hearing Evaluation For Children With Autism
Autism is associated with different kinds of developmental delays and co-existing medical conditions
. Speech and Language delays and hearing disorders such as sensorial loss, hypersensitivity to sound and otitis media are a few examples of associations connected to autism (Davis & Stiegler, 2010). When a diagnosis of autism is being ruled out, a hearing evaluation is one of the tests ordered by a physician. This is to confirm that the speech and language delay is not caused by a hearing problem such as deafness but by the autistic disorder itself or a co-exiting medical disorder is present.According to the Centers for Disease Control and Prevention (CDC), there are 2 steps involved in assessing and diagnosing hearing loss in a child. Hearing screening and a full hearing test.
Hearing Screening
Hearing loss screening is normally suggested to be completed before a newborn child reaches 1 month of age (CDC, 2010). You can have your newborn baby subjected to a hearing screening before you even leave the hospital. This test is easily done and is not harmful in anyway to your child. The test is usually conducted when the baby is sleeping and is completed after just a few minutes. There are 2 types of tests that can be used in screening for hearing loss. Auditory Brainstem Response and Otoacoustic Emission Test.
*Auditory Brainstem Response (ABR)
This test measures your childs brainstem response to sound. It is non-invasive and take up to 5-15 minutes. It is performed by placing small earphones on your childs ears and four to five electrodes are placed on your childs head. A variety of sounds are then presented to identify the loudness and softness hearing capacity and the electrodes pick up the electrical activity of the hearing nerve fibers. For infants, only one sound is presented, which is called the click. If a healthy result is obtained then your child passes the hearing test.
*Otoacoustic Emission Test (OAE)
This test measures the reaction that is produced by the inner ear or cochlea. This test usually takes 5-8 minutes. It is conducted by placing a small microphone and speaker that is enclosed in a probe in your childs ear. Sounds are then presented through the probe. The cochlea then processes the sound and sends it to the brainstem, while another separate sound comes back to the ear canal. This sound that travels back in the ear canal is called the otoacoustic emission. The audiologist can then determine which type of sound produced an emission. If an emission is produced for sounds that are essential to speech comprehension then your child has passed the test.
Full Hearing Test
If a child does not pass a hearing screening, the physician or your childs pediatrician will refer you to an audiologist or an ENT (ear, nose, throat) specialist for a full hearing test or audiology evaluation. These hearing experts will use more extensive ABRs, OETs and a Behavioral Audiometry Evaluation, which tests all parts of the ears for any problems in their individual functions. For older children and adults the following are conducted during a Full Hearing Test:
*Pure-tone Air Conduction Hearing Test
This test identifies the softest tones your child can hear from low to high frequencies with the use of earphones or speakers. The audiologist will then ask the child to respond by raising his or her hand, pressing a button or saying yes when he or she hears the sound. The results are then recorded in an audiogram.
For children with autism, techniques such as Visual Reinforcement Audiometry (VRA) and Conditioned Play Audiometry (CPA) are used to facilitate the hearing test better.
*Visual Reinforcement Audiometry (VRA)
This test is done by having the child look towards the source of the sound and giving the child a reward when the correct response is obtained. Rewards are often visual reinforcements such as watching toy trains that move around a track. This is usually conducted to children ranging from 6 months to 2 years of age.
*Conditioned Play Audiometry (CPA)
This test is conducted by instructing the child to perform a task every time a sound is heard. Tasks may e placing a block in a container or piling rings on a stick. This is suggested for children aging from 2 to 5 years of age.
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