About Central Auditory Processing Disorder

Understanding and Addressing Central Auditory Processing Disorder 

What Is Central Auditory Processing Disorder


The ability to hear and process sound is fundamental for speech and language development and learning. A significant and often misunderstood auditory challenge is auditory processing disorder (APD). Auditory Processing Disorder (APD), also known as Central Auditory Processing Disorder (CAPD), is not a form of hearing loss despite showing difficulty with hearing-related tasks. In patients with APD, hearing thresholds are often normal, but the central nervous system has trouble correctly interpreting the auditory information it receives. This breakdown can be seen in several different areas and may result in a reduced ability for the individual to learn through hearing.

Since they appear to hear normally, the difficulties these individuals experience are often presumed to be the result of an attention deficit, a behavior problem, a lack of motivation, or some other cause. It can be frustrating, and the person with the disorder has no control over their ability or inability to process auditory signals in certain situations. When an individual has difficulty processing auditory information efficiently, it can impact their ability to concentrate, which can, in turn, negatively affect academic performance and quality of work. 

Standard hearing tests assess hearing sensitivity and are not able to determine if an individual has an auditory processing deficit. APD can only be diagnosed by an audiologist following the administration of a comprehensive test battery designed to assess a variety of auditory processes. For individuals who present particular hearing problems despite having good audibility, there may be an Auditory Processing Disorder (APD) present, and further testing may be warranted. 

What Causes Central Auditory Processing Disorders?


The cause of CAPD/APD remains unclear. Research suggests that it can be congenital (some people are born with it), or it can be acquired. Evidence suggests that some risk factors for APD may include:

  • Age-related changes in the Central Auditory Nervous System (CANS) function
  • Head trauma
  • Chronic ear infections
  • Neuromaturational delay
  • ADHD
  • Traumatic brain injury

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