Speech and language

Is It Autism or Auditory Processing Disorder? How to Tell

Autism and auditory processing disorder can look alike. How they differ, where they overlap, how each is diagnosed, and what helps a child who struggles to listen.

• Expert Reviewed
• Evidence Based
• Patient Focused

Reviewed by Dr. Eva Lassey, PT, DPT · Last updated October 10, 2026

Is auditory processing disorder autism? No. APD is a hearing-related diagnosis an audiologist makes when the brain struggles to make sense of sound, especially speech in noise. Autism is a neurodevelopmental condition defined by social communication differences and repetitive behaviors. They can look alike, a child can have both, and a hearing test comes first.⁠^1,2,3,4

Your child misses spoken instructions, struggles to follow conversation in noisy places and often asks you to repeat yourself. Those are listed signs of central auditory processing disorder, and listening trouble of the same kind turns up in autism, ADHD, language disorders and ordinary hearing loss, which is why the two labels get confused.⁠^4,5,6 This guide sets out how autism and auditory processing disorder differ, where they overlap, how each is diagnosed and what helps while you find out.

Key takeaways

• APD is classified with hearing disorders and diagnosed by an audiologist; autism is classified with neurodevelopmental disorders and diagnosed from development and behavior.⁠^1,2,3,7
• Autism requires persistent social communication differences and at least two kinds of restricted, repetitive behavior; neither is part of APD's definition.⁠^3,5
• Trouble with speech in noise is not unique to APD: autistic children did worse than matched peers on listening tests in one study, and autistic people needed a clearer signal in another.⁠^4,8
• Hearing comes first: hearing loss can look like either, and among 199 autistic children and teens, 7.9% had mild to moderate hearing loss and 3.5% pronounced to profound loss.⁠^5,9,10
• Most APD tests need a developmental age of 7 or 8, while autism can be diagnosed reliably by about age 2.⁠^2,11
• APD is contested: nine published sets of criteria gave rates from 7.3% to 96% in the same children, and no study has compared children with APD and autistic children directly.⁠^6,12
• Distress at everyday sounds is common in autism, about 41% at any one time, and is not among the listed signs of APD.⁠^5,13
• Help does not wait for a label: less noise and echo, slower and clearer speech, visual backup and remote microphones, which improved speech in noise for autistic children; auditory integration training lacks evidence.⁠^4,5,9

How do autism and auditory processing disorder differ at a glance?

Autism and auditory processing disorder side by side

	Autism	Auditory processing disorder (APD)
What it is	A developmental disability caused by differences in the brain⁠11	Trouble making sense of sounds, in how the brain processes them⁠5,14
How it is classified	A neurodevelopmental disorder, ICD-11 code 6A02⁠7	A disorder with hearing impairment, in the ICD-11's chapter on the ear⁠1
Who diagnoses	Specialists such as developmental pediatricians and child neurologists, from history and observation⁠3	An audiologist, with a battery of listening tests⁠2
Core features	Social communication differences plus at least two kinds of restricted, repetitive behavior⁠3	Difficulty with speech in noise or competing voices, fast or degraded speech, and other listening skills⁠5
Hearing test	Comes first: hearing loss can look like autism⁠9	Comes first: hearing loss has to be ruled out⁠5
Distress at everyday sounds	Common, about 41% at any one time⁠13	Not among the listed signs⁠5
Earliest reliable diagnosis	About age 2, by an experienced professional⁠11	Most tests need a developmental age of 7 or 8⁠2
Can a child have both?	Yes. They are separate diagnoses, and autistic children can show the listening deficits APD tests measure.⁠4

Is auditory processing disorder a form of autism?

No. The World Health Organization's ICD-11 lists auditory processing disorder and central auditory processing disorder under other specified disorders with hearing impairment, in its chapter on diseases of the ear, while autism spectrum disorder sits with the neurodevelopmental disorders. An audiologist diagnoses APD; autism is diagnosed from a child's development and behavior.⁠^1,2,3,7

So you can have auditory processing disorder without autism. APD's definition is about listening, not social communication or repetitive behavior, and the American Speech-Language-Hearing Association (ASHA) names ADHD, language disorders and learning disabilities as the conditions it can co-occur with and has to be told apart from.⁠⁵

The link people notice is real, though. A review of two decades of research found substantial evidence of atypical auditory processing in autism, most marked for complex sounds and for speech, and autistic children have done worse than matched peers on tests of temporal processing, spatial listening and speech in noise.⁠^4,15 Listening difficulty alone is not a sign of autism, which also needs social communication differences and repetitive behaviors.⁠³

What is autism?

Autism spectrum disorder is a developmental disability caused by differences in the brain. It begins before age 3 and can last throughout life: some children show signs within the first 12 months, others not until 24 months or later, and some gain skills until about 18 to 24 months and then stop or lose them.⁠¹¹ About 1 in 31 eight-year-olds in the US has been identified with autism, and it is over 3 times more common in boys.⁠¹⁶

The DSM-5 requires persistent differences in all three areas of social communication: back-and-forth social and emotional exchange; nonverbal communication such as eye contact, gestures and body language; and developing and keeping relationships. Spoken language can be fluent: the ICD-11 describes pragmatic difficulties such as an overly literal understanding of what others say and speech without the usual tone.⁠^3,7 It also requires at least two of four kinds of restricted, repetitive behavior:⁠³

• Repetitive movements, use of objects or speech, such as stimming, lining up toys or echolalia.⁠^3,17
• Insistence on sameness and routines, with distress at small changes.⁠³
• Highly focused interests that are unusual in intensity or focus.⁠³
• Over- or under-reaction to sensory input, such as an adverse response to specific sounds, or unusual interest in it.⁠³

That last criterion is where sound comes in. Auditory differences in autism belong to a wider sensory pattern, and the ICD-11 notes that in preschool children sensitivity to everyday sounds can overshadow the social communication differences underneath.⁠⁷

What are the early signs of autism?

The CDC's examples include not keeping eye contact, not responding to their name by 9 months, few or no gestures such as waving by 12 months, not pointing to show you something interesting by 18 months, and unusual reactions to the way things sound, smell, taste, look or feel.⁠¹⁷ Not answering to a name is also what hearing loss looks like, which is why ASHA treats hearing as a first check.⁠⁹ The American Academy of Pediatrics recommends autism screening at 18 and 24 months, or whenever a parent or provider is concerned.⁠¹⁸

Is there such a thing as auditory autism?

Not as a diagnosis. Neither the DSM-5 criteria nor the ICD-11 has an auditory type of autism; the ICD-11's subtypes turn on intellectual development and language.⁠^3,7 People use the phrase for the ways autism affects hearing and listening, which are real:

• Sound intolerance. A meta-analysis of 67 studies estimated that about 41% of autistic people have hyperacusis, reduced tolerance of sound at levels that would not trouble most people, at any one time, and about 61% at some point in life.⁠¹³
• Speech in noise. In one study, 11 high-functioning autistic people needed speech 2 to 3.5 dB louder, relative to the background, than matched controls when the background sound had dips in it, the gaps that normally let a listener catch glimpses of speech.⁠⁸
• Complex sound. Differences are most likely with complex sounds and more marked for speech than for other sounds.⁠¹⁵
• Hearing loss. Among 199 autistic children and teens, 7.9% had mild to moderate hearing loss and 3.5% pronounced to profound loss, well above the general population, and middle-ear fluid was found in 23.5%.⁠¹⁰

For the sound sensitivity side, see sensory processing and autism.

What is auditory processing disorder?

Auditory processing disorder (APD), also called central auditory processing disorder (CAPD), describes trouble making sense of the sounds around you.⁠¹⁴ The ears can hear. ASHA defines CAPD as a deficit in how the central auditory nervous system processes sound, not caused by hearing loss or by higher-level language or cognitive problems, and shown by poor performance in skills such as telling sounds apart, judging timing and patterns, locating sound, and listening to competing or degraded speech.⁠⁵ It has a diagnosis code, H93.25, in the ICD-10 classification used for US medical records, and an index entry in the ICD-11.⁠^1,5,19

Think of a phone call on a bad line: the voice comes through, but parts of the message get lost. In school-age children, reported rates range from 0.2% to 6.2% depending on the study, and children with ADHD or learning disabilities are more likely to have it. Causes can include neurological conditions and hearing deprivation from repeated ear infections, or none may be found.⁠⁵

What are the symptoms of auditory processing disorder in children?

ASHA's list of possible signs, which it notes can also point to other conditions such as language disorders:⁠⁵

• Speech in noise: difficulty understanding speech against competing voices, background noise or echo, or when it is fast.⁠⁵
• Repeats and delays: frequent requests for repetition, slower responses, answers that miss the point.⁠⁵
• Complex directions: difficulty following multi-step spoken instructions.⁠⁵
• Tone of voice: missing the prosody changes that signal sarcasm or a joke.⁠⁵
• Songs and school: trouble learning songs and nursery rhymes, and reading, spelling or learning problems.⁠⁵

Using more than one language can make a child seem to process speech poorly, and ASHA is clear that this alone does not indicate CAPD.⁠⁵ The auditory processing disorder guide covers the condition in more depth.

Can adults have auditory processing disorder?

Yes. ASHA's guidance covers children and adults, difficulties that begin in childhood can continue into adulthood, and a European consensus notes APD can bring low self-esteem, anxiety and depression.⁠^5,19

What are the key differences between autism and APD?

Both can leave a child struggling to follow directions in class, so the useful question is why.

• Scope. APD is defined around listening; autism spans social communication, behavior and sensory responses across several senses.⁠^3,5
• Social communication and nonverbal cues. Autism requires persistent differences in social exchange, in eye contact, gestures and body language, and in relationships; APD's definition and listed signs include none of these.⁠^3,5
• Repetitive behaviors and interests. At least two kinds are required for autism, and the CDC notes they set autism apart from conditions defined by social communication problems alone. They are not part of APD.⁠^3,5,17
• Missing a joke or sarcasm. This can come from either: missing the tone changes that signal sarcasm is a listed sign of CAPD, while autism's pragmatic differences include an overly literal reading of speech.⁠^5,7
• The noisy room. Both can struggle. Speech in noise is APD's core complaint, but autistic people also need a clearer signal, and distress at the noise itself is common in autism and not a listed sign of CAPD.⁠^5,8,13
• Age at diagnosis. Autism can be diagnosed reliably by about 2; most APD tests need a developmental age of 7 or 8.⁠^2,11

Is it autism, APD or ADHD?

ADHD is the overlap ASHA names first: CAPD can co-occur with ADHD and has to be told apart from it, and children with ADHD are more likely to have a coexisting CAPD diagnosis.⁠⁵ In 1,469 children aged 6 to 11 with normal hearing, attention-related response variability and cognitive scores predicted listening and communication problems far better than sensory measures did, and the authors suggested APD is primarily an attention problem.⁠²⁰ Autism and ADHD can also occur together, and ADHD symptoms can make autism less apparent.⁠⁷ There is no single test for ADHD; a pediatrician, psychologist or psychiatrist diagnoses it, and the medical exam includes hearing and vision tests.⁠²¹

Is it autism, APD or a language disorder?

The labels blur most here. "Language processing disorder" is one of the names professionals use for a processing problem, and ASHA splits the work: audiologists evaluate how the auditory signal is received and passed on, speech-language pathologists how its meaning is processed, and both share the sound-level, phonemic step.⁠⁵ In a review of 13 studies, children diagnosed with APD performed like children with specific language impairment, dyslexia, ADHD or learning disorders on tests of intelligence, memory, attention and language.⁠⁶ The ICD-11 separates autism from developmental language disorder: children with a pragmatic language disorder usually respond to social and emotional cues and share interests, and do not show restricted, repetitive behaviors.⁠⁷ → Language processing disorder

How do you get an accurate diagnosis of autism or APD?

Because the overlap is wide, the order of steps matters, and a child can end up with more than one diagnosis: in a review of 13 studies of APD, ten included children who met criteria for more than one.⁠⁶

1. Start with your pediatrician. The American Academy of Pediatrics recommends developmental screening at 9, 18 and 30 months and autism screening at 18 and 24 months, or whenever someone is concerned. You can also request a free evaluation yourself, without a referral: through early intervention under age 3, or any local public elementary school from 3.⁠¹⁸
2. Test hearing first. Hearing loss has to be found or ruled out before an APD evaluation, and knowing a child's hearing before an autism assessment is a fundamental step toward a reliable diagnosis.⁠^5,9
3. Autism evaluation. There is no blood test; specialists such as developmental pediatricians and child neurologists combine your account of your child's development with direct observation, and no single tool decides it.⁠^3,11
4. APD evaluation. An audiologist runs a battery of listening tests in a sound-controlled room, usually once a child reaches a developmental age of about 7; one common criterion is scores at least 2 standard deviations below the mean on two or more tests.⁠^2,5
5. The team. A speech-language pathologist assesses spoken and written language, phonological skills and social communication, and a psychologist may test memory, attention and executive function; ASHA advises assessing related disorders before APD testing where possible, since they can rule it out or muddy the results.⁠⁵ An occupational therapist can assess wider sensory differences.⁠²²

Find a speech-language pathologist or an occupational therapist near you.

How is auditory processing disorder actually tested?

This is where the two paths diverge most clearly. APD is diagnosed by an audiologist, using a battery of listening tests given in an acoustically controlled room: words against background noise, different words in each ear at once, speech that is filtered or speeded up, and patterns of sounds.⁠^2,5 Autism is not diagnosed that way; it is assessed from development, history and observation.⁠³

• A standard hearing test comes first, always. CAPD is not due to hearing loss, whether conductive or sensorineural, and hearing loss, auditory neuropathy and hidden hearing loss can all affect understanding of speech in noise.⁠⁵ Fluid behind the eardrum is common: five out of six children have an ear infection by age 3, fluid can stay after one with no symptoms, and long-lasting fluid can affect hearing.⁠²³ Guidelines call for a hearing test when fluid lasts 3 months or longer.⁠²⁴
• Age matters. Many APD tests need a developmental age of 7 or 8, and results in younger children are hard to interpret, so an audiologist who suggests waiting is not brushing you off.⁠²
• Language and attention matter too. A significant language delay or disorder can prevent reliable testing; ADHD, anxiety and depression can affect attention and motivation during it; and ASHA advises testing children on their usual medication.⁠^2,5
• Checklists are not a diagnosis. There is no universally accepted screening method, and questionnaires or single tests do not replace a full battery.⁠^2,5

Can autistic children be tested for APD?

Sometimes, with care. APD tests were normed on children with typical intelligence and cognition; with a significant language disorder or questions about cognition, results can be hard or impossible to interpret, and a multidisciplinary assessment becomes essential.⁠² A preference for sameness, sensory sensitivity and receptive language differences can make even a basic hearing test harder, and ASHA suggests visual supports and schedules and, where behavioral results are unreliable, objective tests such as otoacoustic emissions or auditory brainstem responses.⁠⁹ Some autistic children do complete auditory processing tests: in one study, 20 did tests of temporal processing, spatial listening and speech in noise.⁠⁴

Why is APD more contested than most parents are told?

Most articles present autism and APD as two settled categories. One of them is not, and knowing that early saves confusion later. ASHA's own practice portal says professionals have adopted varying perspectives on CAPD, reflecting ongoing debate about how to define, assess and treat it, because of varied symptoms and definitions, the lack of a reference standard for diagnosis and the overlap with language disorders.⁠⁵ The children's difficulties are real: they differ from their peers on many measures. The debate is whether the difficulty is specifically auditory or comes from attention, language or memory and shows most when listening is hard.⁠²⁵

• The criteria change the answer. Applying nine published sets of criteria to the same 150 referred children with normal hearing gave APD rates from 7.3% to 96%.⁠¹²
• The profile overlaps. Children diagnosed with APD performed like children with language impairment, dyslexia, ADHD or learning disorders on cognitive and language tests, with only small differences on perception tasks; the studies were of moderate quality.⁠⁶
• Attention predicts more than hearing does. In 1,469 children, listening and communication problems tracked attention and cognitive scores, and only weakly the sensory measures.⁠²⁰
• The label depends on who you see. A child given a specific learning disability label by one group of experts may get an APD diagnosis from another, and a 2009 review concluded APD as diagnosed is not a coherent category but should be improved, not abandoned.⁠²⁶

Worth knowing on this page in particular: the 2018 review found no study comparing children diagnosed with APD with autistic children.⁠⁶ Any confident account of how the two differ, including this one, describes the two definitions rather than a tested way of telling them apart. ASHA adds that not every CAPD diagnosis is a limitation, or a condition that must be treated.⁠⁵

What this means in practice. Do not let the label become the goal. A child who cannot follow instructions in a noisy classroom needs the room changed and the skills taught, and much of that is the same whether the eventual diagnosis is APD, a language disorder, ADHD or autism: ASHA's strategies for CAPD overlap with language therapy, and listening devices have helped autistic children too.⁠^4,5 Chase the accommodations first; the label can catch up.

What else can look like autism or APD?

Autism and APD are two candidates on a longer list. Any of these can produce a child who seems not to hear you, and they often overlap rather than compete.⁠⁶

• Hearing loss, including the kind that comes and goes. Fluid behind the eardrum can affect hearing with no other symptoms, and middle-ear fluid and related hearing loss appear more common in autistic children.⁠^10,23
• Developmental language disorder. A child who has not processed the sentence has not failed to hear it, and APD and language impairment look alike on testing.⁠⁶
• ADHD. Difficulty paying attention is on ASHA's list of possible CAPD signs, and ADHD is the first condition ASHA says CAPD must be told apart from.⁠⁵
• Dyslexia and other learning differences, which share reading and spelling problems with CAPD and performed like APD on most measures.⁠^5,6
• Sensory over-responsivity. A child overwhelmed by classroom noise may be coping with the sound rather than following the lesson; over-responsive people often react to loud noise with fight or flight and cover their ears.⁠²⁷ See also autism and noise sensitivity and what helps when a child cannot cope with loud noises.
• Anxiety. Anxiety can affect attention and motivation during listening tests, and in autism a co-occurring condition such as anxiety is often what first brings someone to clinical attention, particularly from adolescence.⁠^2,7
• Selective mutism. A child who talks freely at home but not at school; in autism, the social communication differences show in every setting.⁠⁷
• Social (pragmatic) communication disorder. The DSM-5 directs people with marked social communication difficulties who do not meet autism's other criteria to be evaluated for it.⁠³

What helps a child with autism or APD, whichever it is?

Nearly everything worth doing can start before a diagnosis exists, and ASHA's recommendations for CAPD are the place to start:⁠⁵

• Get attention before speaking, then check understanding: ask your child to tell you back what to do, and repeat or rephrase when a message is missed.⁠⁵
• Slow down and chunk it. Speak a little more slowly, pause more often, stress key words and give one step at a time; clear speech helps on its own or with a listening device.⁠^2,5
• Lower the noise and echo. Cover hard surfaces, add soft absorbent materials, and move or switch off noise sources such as a humming light or an aquarium.⁠⁵
• Ask about a remote microphone system. The teacher wears a microphone that sends their voice to the child. ASHA lists these systems for school-age children who struggle to understand classroom speech, and in autistic children a six-week trial improved speech perception in noise, with benefits reported by children and teachers; eight of ten kept using them.⁠^4,5
• Give visual backup. Pair spoken instructions with visuals such as written steps, a visible schedule or a demonstration, and preview new material.⁠⁵

The guides to auditory processing disorder and autism spectrum disorder go deeper into each condition, and the autism or APD quiz walks through the signs.

What therapies help auditory processing disorder?

ASHA describes three approaches, often used together: changing the listening environment, direct auditory skills training, and compensatory strategies that build language, memory and attention to fill the gaps. Some clinicians support direct auditory training and others question it, early evidence for computer-based programs is supportive, and some treatment overlaps with language therapy.⁠⁵ Personal listening devices suit children whose difficulties show on speech-in-noise and similar tests.⁠²

Do listening programs and auditory integration training help?

Be wary. The American Academy of Audiology's guidelines say commercial sound-based programs such as Berard auditory integration training, the Tomatis method and the Listening Program, marketed for auditory processing problems and for autism, are not supported by the major professional associations in audiology and pediatrics, citing a lack of evidence, questionable science, poor research design and a risk of harm from excessive sound levels. ASHA's position is that auditory integration training has not met scientific standards for efficacy.⁠^2,9

What support is there at school?

In the US, special education under the Individuals with Disabilities Education Act covers named categories, including autism, hearing impairment, speech or language impairment and specific learning disability, whose definition includes a disorder in understanding or using language that may show as an imperfect ability to listen. Auditory processing disorder is not one of the named categories, so eligibility depends on whether a child's needs fit one of them. Eligibility follows a school evaluation, which you can request from age 3.⁠^18,28

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Frequently Asked Questions

Is auditory processing disorder a form of autism?

No. The ICD-11 classifies APD with disorders involving hearing and autism with neurodevelopmental disorders, and they are diagnosed by different professionals. A child can have either, both or neither.⁠^1,2,7

Can a child have both autism and APD?

Yes. They are separate diagnoses, and autistic children can show the listening deficits APD tests measure: in one study they did worse than peers on temporal processing, spatial listening and speech in noise. No study has compared children with APD and autistic children directly.⁠^4,6

Can you have auditory processing disorder without autism?

Yes. APD's definition is about listening, not social communication or repetitive behavior, and ASHA lists ADHD, language disorders and learning disabilities as the conditions it can co-occur with.⁠⁵

Is autism a processing disorder?

No. Autism is a neurodevelopmental condition defined by social communication differences and restricted, repetitive behaviors, with sensory differences part of that pattern. APD is a specific difficulty processing sound, classified with hearing disorders.⁠^1,3,7

My child's hearing test was normal. Could they still have APD?

Yes. A standard hearing test checks whether sound reaches the brain; APD testing looks at what happens next. Hearing loss has to be ruled out first because it causes similar listening problems and can affect APD testing.⁠⁵

Why does my child need an audiologist to be diagnosed with APD?

Because APD is a hearing diagnosis: audiologists are the professionals charged with evaluating hearing, and the test battery has to be given in an acoustically controlled room and interpreted by a trained audiologist.⁠²

At what age can a child be tested for auditory processing disorder?

Usually from about 7. Many APD tests need a developmental age of 7 or 8, and results in younger children are hard to interpret, so an audiologist who suggests waiting is not brushing you off.⁠²

Does my child need a hearing test before APD testing?

Yes, always. CAPD is not due to hearing loss, so ordinary hearing loss, including from fluid behind the eardrum, has to be ruled out first.⁠^5,23

If both kids struggle in noisy places, how do I tell APD apart from autism?

Look beyond the noise. Both can struggle with speech in noise, but autism also involves social communication differences and repetitive behaviors, and distress at everyday sounds is common in autism and not a listed sign of APD.⁠^3,5,8,13

What is auditory autism?

Not a diagnosis. The phrase usually means the ways autism affects hearing and listening: sound intolerance in about 41% of autistic people at any one time, more difficulty with speech in noise, and higher rates of hearing loss.⁠^8,10,13

Do autistic people have auditory processing problems?

Research finds substantial evidence of atypical auditory processing in autism, most with complex sounds and speech, and autistic children have done worse than peers on listening tests such as speech in noise.⁠^4,15

Is it APD or ADHD?

It can be both. ASHA says CAPD can co-occur with ADHD and must be told apart from it, and in a large study attention predicted listening problems better than hearing measures did. A pediatrician, psychologist or psychiatrist diagnoses ADHD.⁠^5,20,21

How can I support my child at home if I suspect one of these conditions?

Lower background noise, get your child's attention before speaking, keep instructions short and one step at a time, pair words with visuals, and check understanding by asking them to tell you back. ASHA recommends these for CAPD, and none depends on a diagnosis.⁠⁵

Can adults have auditory processing disorder?

Yes. ASHA's guidance covers children and adults, and difficulties that begin in childhood can continue into adulthood.⁠^5,19

Is auditory processing disorder a disability?

It can affect learning and communication, but US special education law does not name it as a category, so eligibility depends on whether a child's needs fit one that it does name, such as specific learning disability or speech or language impairment.⁠^19,28

Do listening programs help APD or autism?

Commercial sound-based programs such as auditory integration training are not supported by the main audiology and pediatric associations, and ASHA says auditory integration training has not met scientific standards for efficacy.⁠^2,9

Sources

1. World Health Organization. ICD-11 for Mortality and Morbidity Statistics: AB5Y Other specified disorders with hearing impairment. Version 2025-01. The code sits under “Disorders with hearing impairment” in chapter 10, “Diseases of the ear or mastoid process”; its index terms include “Auditory processing disorder,” “CAPD - [central auditory processing disorder]” and “APD - [auditory processing disorder].” Checked October 10, 2026.
2. American Academy of Audiology. Clinical practice guidelines: diagnosis, treatment and management of children and adults with central auditory processing disorder. Guideline document dated August 24, 2010. Checked October 10, 2026.
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   “Since audiologists are the professionals who are charged with evaluating hearing and balance ..., and auditory processing is a key aspect of hearing, it follows that audiologists are responsible for diagnosing (C)APD”; the test battery “must be administered in an acoustically-controlled environment”; “Many behavioral tests of central auditory processing in current clinical use require a minimum developmental age of seven or eight years, or a level of cognitive functioning that is consistent with this age range” and “Interpretation of results of behavioral measures of central auditory function in children under age 7 years (developmental age) is difficult”; “the central auditory tests available for clinical use have been normed on individuals with normal intelligence and cognitive function”; “Many comorbid conditions, such as ... attention deficit hyperactivity disorder (ADHD), anxiety disorder, and depression, which may affect attention can also affect motivation”; “In cases of questionable cognitive function or intelligence, the need for multidisciplinary assessment becomes imperative”; “the presence of a significant language delay, disorder or difference will preclude the reliable administration of a test battery or will severely limit the types of procedures that can be employed”; “behavioral checklists, screening measures, and/or single test assessments do not constitute a comprehensive diagnostic battery”; “Specific treatment options (e.g., personal FM systems) may be more appropriately recommended for individuals who present deficits on monaural low-redundancy (e.g., speech recognition in noise, filtered or compressed speech) and/or dichotic speech tests. Using clear speech (i.e., focusing on a slower rate, enunciating, emphasizing key words, and pausing more often) enhances the clarity of the signal”; alternative sound-based programs that purport to address auditory processing problems “(as well as a range of other disorders including autism)” such as “Berard Auditory Integration, Tomatis Approach, Listening Program” “have not been supported by the major professional associations representing audiology and pediatrics due to the lack of evidence demonstrating efficacy, questionable scientific foundations, poor research designs, and potential to cause harm due to lack of acoustic rigor and controls (e.g., excessive noise levels)”; and central auditory dysfunction “may be of particularly high prevalence in the aging population.”
3. Centers for Disease Control and Prevention. Clinical Testing and Diagnosis for Autism Spectrum Disorder. Page reviewed May 8, 2025. Checked October 10, 2026.
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   “Diagnosing autism spectrum disorder (ASD) usually relies on two main sources of information: parents’ or caregivers’ descriptions of their child’s development and a professional’s observation of the child’s behavior”; “no single tool should be used as the basis for diagnosis”; specialists include “neurodevelopmental pediatricians, developmental-behavioral pediatricians, child neurologists, geneticists, and early intervention programs that provide assessment services”; “To meet diagnostic criteria for ASD according to DSM-5, a child must have persistent deficits in each of three areas of social communication and interaction ... plus at least two of four types of restricted, repetitive behaviors”: “Deficits in social-emotional reciprocity,” “Deficits in nonverbal communicative behaviors used for social interaction, ranging, for example, from poorly integrated verbal and nonverbal communication; to abnormalities in eye contact and body language or deficits in understanding and use of gestures,” “Deficits in developing, maintaining, and understanding relationships”; and “Stereotyped or repetitive motor movements, use of objects, or speech (e.g., simple motor stereotypes, lining up toys or flipping objects, echolalia, idiosyncratic phrases),” “Insistence on sameness ... (e.g., extreme distress at small changes ...),” “Highly restricted, fixated interests that are abnormal in intensity or focus” and “Hyper- or hyporeactivity to sensory input or unusual interest in sensory aspects of the environment (e.g. ... adverse response to specific sounds or textures ...)”; and “Individuals who have marked deficits in social communication, but whose symptoms do not otherwise meet criteria for autism spectrum disorder, should be evaluated for social (pragmatic) communication disorder.”
4. Rance G, Saunders K, Carew P, Johansson M, Tan J. The use of listening devices to ameliorate auditory deficit in children with autism. Journal of Pediatrics. 2014;164(2):352–357. PMID 24183205. Checked October 10, 2026.
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   The abstract: “Auditory temporal processing (amplitude modulation detection), spatial listening (integration of binaural difference cues), and functional hearing (speech perception in background noise) were evaluated in 20 children with ASD. Ten of these subsequently underwent a 6-week device trial”; “Auditory temporal processing and spatial listening ability were poorer in subjects with ASD than in matched controls”; “FM listening systems resulted in improved discrimination of speech in noise,” with participant and teacher questionnaires showing benefits; “Eight of the 10 participants who undertook the 6-week device trial remained consistent FM users at study completion”; and “Sustained use of FM listening devices can enhance speech perception in noise, aid social interaction, and improve educational outcomes in children with ASD.”
5. American Speech-Language-Hearing Association. Central Auditory Processing Disorder. Practice Portal, undated. Checked October 10, 2026.
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   “The scope of this page is central auditory processing disorder (CAPD) in children and adults”; “ASHA (2005) uses the term central auditory processing disorder (CAPD) to refer to deficits in the neural processing of auditory information in the CANS (not due to higher order language or cognitive factors) demonstrated by poor performance in one or more of the following skills: sound localization and lateralization; auditory discrimination; auditory pattern recognition; temporal aspects of audition; auditory performance in competing acoustic signals; auditory performance with degraded acoustic signals” (list punctuation added), terminology that “aligns with the National Center for Health Statistics classification of the diagnosis within the International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM)”; terms include “‘auditory processing disorder,’ ‘(central) auditory processing disorder,’ ‘language processing disorder,’ and ‘auditory information processing disorder’”; “CAPD may co-occur with (and necessitate differentiation from) other disorders (e.g., attention-deficit/hyperactivity disorder, language delay or disorder, and learning disability)”; “CAPD is not due to peripheral hearing loss, whether conductive (i.e., involving the outer or middle ear) or sensorineural (i.e., involving the cochlea or auditory nerve)”; “Professionals have adopted varying perspectives on the interpretation of CAPD ... These different perspectives reflect ongoing debate regarding how to define, assess, and treat CAPD,” for reasons “including the heterogeneity of symptoms, variations in the definition, the lack of a reference standard for diagnosis, the relationship between auditory perceptual deficits and language disorders”; “not all diagnoses of CAPD represent a limitation for the individual ... or a condition that must be treated”; “In school-age children, reported CAPD prevalence rates range from 0.2% ... to 2.5% ... to 6.2%,” and children with ADHD or learning disability diagnoses “are more likely to have a coexisting CAPD diagnosis or have auditory processing differences”; difficulties in childhood “may continue ... into adulthood”; signs may include “difficulty understanding spoken language in competing messages, in noisy backgrounds, in reverberant environments, or when presented rapidly,” “longer response time during oral communication,” “frequent requests for repetitions,” “inconsistent or inappropriate responses during oral communication,” “difficulty following complex auditory directions,” “difficulty learning songs or nursery rhymes,” “misunderstanding messages (e.g., difficulty detecting prosody changes that help to interpret sarcasm or jokes),” “difficulty paying attention or avoiding distractions” and “reading, spelling, and/or learning problems,” while “the use of multiple languages may influence the perception of a communication partner’s auditory processing but do[es] not indicate CAPD”; causes “may be linked to a specific lesion or disorder or may be unknown” and include “neurological disorder, disease, or damage” and “auditory deprivation secondary to recurrent otitis media”; “CAPD is an auditory deficit diagnosed by an audiologist ... However, there is currently no reference standard for diagnosing CAPD”; “There is no universally accepted method for screening for CAPD”; “Audiologists are responsible for evaluating and diagnosing problems in the reception and/or transference of auditory signals ... SLPs are responsible for evaluating and diagnosing problems in the linguistic processing of the auditory signal. Audiologists and SLPs share responsibility for diagnosing problems in the phonemic processing”; a speech and language evaluation covers “spoken and written language, phonemic awareness, phonological working memory and phonological retrieval, and social communication,” and psychoeducational testing “memory, executive functioning, and attention”; “Delays in auditory processing resulting from multilanguage learning are not considered disorders if the delay does not exist in all language(s) used”; “It is essential to conduct an audiologic evaluation to diagnose or rule out hearing loss ... Peripheral hearing loss can present with similar listening difficulties to CAPD. The presence of peripheral hearing loss may affect CAPD testing,” peripheral disorders include “auditory neuropathy spectrum disorder” and “cochlear synaptopathy (i.e., hidden hearing loss),” and “These disorders can affect an individual’s ability to hear and understand speech in background noise to varying degrees”; test types include dichotic tests of “different auditory stimuli presented to each ear simultaneously” and low-redundancy tests of “speech in noise, speech in competition, low-pass filtered speech, or compressed (rapid) speech”; related disorders should be referred “preferably before central auditory processing testing is completed, as co-occurring diagnoses may preclude central auditory processing testing or interfere with accurate interpretation”; “Test individuals who are successfully medicated for attention, anxiety, or other disorders while they are medicated”; one criterion is “at least 2 SDs below the mean on two or more tests in the battery”; treatment combines “Environmental modifications,” “Direct skills remediation” and “Compensatory strategies,” and some approaches “may be the same as those used for spoken or written language disorders”; hearing assistive technology “may be considered for school-age children who are having difficulties understanding auditory messages in the classroom”; listening rooms can be improved to “Cover reflective surfaces,” “Use various absorption materials” and “Reduce competing signals by eliminating or moving external noise sources (e.g., aquariums, fluorescent lights that hum)”; strategies include “requesting the presenter to speak more slowly, pause more often, emphasize key words, and ‘chunk’ instructions,” “asking the speaker to check that the listener has understood and to use repetition and rephrasing when communication breakdowns occur,” “pairing verbal presentations or instructions with visuals” and “preview information prior to instruction”; and “Although some clinicians support direct skills remediation in this population, others have provided scrutiny,” while for computer-based training “early evidence is supportive.”
6. de Wit E, van Dijk P, Hanekamp S, Visser-Bochane MI, Steenbergen B, van der Schans CP, Luinge MR. Same or different: the overlap between children with auditory processing disorders and children with other developmental disorders: a systematic review. Ear and Hearing. 2018;39(1):1–19. PMID 28863035. Checked October 10, 2026.
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   The abstract: “In total, 13 studies of which the methodological quality was moderate were included”; “Ten of the studies included children who met the criteria for more than one diagnosis”; “There were no studies found in which the performance of children diagnosed with APD was compared with the performance of children diagnosed with autism spectrum disorder”; and “Children diagnosed with APD perform equally to children diagnosed with SLI, dyslexia, ADHD, and LD on tests of intelligence, memory or attention, and language tests. Only small differences between groups were found for sensory and perceptual functioning tasks (auditory and visual).”
7. World Health Organization. ICD-11 for Mortality and Morbidity Statistics: 6A02 Autism spectrum disorder. Version 2025-01, with the clinical descriptions and diagnostic requirements. Checked October 10, 2026.
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   The code sits under “Neurodevelopmental disorders” in chapter 06, and its subtypes are set by intellectual development and functional language; essential features include “Lifelong excessive and persistent hypersensitivity or hyposensitivity to sensory stimuli or unusual interest in a sensory stimulus, which may include actual or anticipated sounds”; “Pragmatic language difficulties may manifest as an overly literal understanding of others’ speech, speech that lacks normal prosody and emotional tone”; in preschool children “Sensory sensitivities to everyday sounds, or to foods, may overshadow the underlying social communication deficits”; “In a substantial proportion of cases, particularly in adolescence and adulthood, it is a co-occurring disorder that first brings an individual with Autism Spectrum Disorder to clinical attention,” and in middle childhood “there may be prominent symptoms of anxiety”; individuals with developmental language disorder of the pragmatic type, “Unlike individuals with Autism Spectrum Disorder ... are usually able to initiate and respond appropriately to social and emotional cues and to share interests with others” and do not typically show restricted, repetitive behavior; autism and ADHD “can co-occur,” and “Attention Deficit Hyperactivity Disorder symptoms may sometimes dominate the clinical presentation such that some Autism Spectrum Disorder symptoms are less apparent”; and “Selective Mutism is characterized by normal use of language and patterns of social communication in specific environments, such as the home, but not in others, such as at school,” whereas in autism the differences “are evident across all situations and contexts.”
8. Alcántara JI, Weisblatt EJ, Moore BC, Bolton PF. Speech-in-noise perception in high-functioning individuals with autism or Asperger’s syndrome. Journal of Child Psychology and Psychiatry. 2004;45(6):1107–1114. PMID 15257667. Checked October 10, 2026.
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   The abstract: “SRTs were measured for 11 individuals with HFA/AS and 9 age/IQ-matched normal-hearing control subjects”; “A statistically significant difference in SRTs between the subject groups was found only for those background sounds that contained temporal or spectro-temporal dips. SRTs for the HFA/AS individuals were 2 to 3.5 dB higher than for the controls, equivalent to a substantial decrease in speech recognition”; and the difficulties “may be due, in part, to a reduced ability to integrate information from glimpses present in the temporal dips” of the background.
9. American Speech-Language-Hearing Association. Autism and Autism Spectrum Disorder. Practice Portal, undated. Checked October 10, 2026.
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   Co-occurring conditions listed include “42% for hyperacusis (Z. J. Williams et al., 2021)” and “5%–13.0% for hearing loss (Rosenhall et al., 1999; Trudeau et al., 2021)”; screening typically includes “hearing screening to rule out hearing loss as a contributing factor to communication and behavior difficulties”; “Because children with ASD are often initially suspected of having a hearing problem, audiologists play a critical role in (a) recognizing the possible signs of ASD in children whose hearing they test and (b) making appropriate referrals for screening”; “Knowing a child’s hearing acuity prior to an ASD assessment is a fundamental step in ensuring a reliable diagnosis”; “The potential similarities in presentation between hearing loss and ASD (e.g., a lack of response when someone calls their name)” and the possibility that both are present “can make diagnosis challenging”; behaviors that make hearing assessment harder include “comfort with ‘sameness’ and an aversion to novel situations; (b) hypersensitivity and negative responses to sensory input; and (c) communication differences, such as receptive language deficits,” with suggestions to “Use visual supports and schedules” and to consider “objective tests, such as otoacoustic emissions and/or auditory brainstem response testing”; assistive technology “can include hearing technology, FM systems”; and “The 2002 ASHA Work Group on AIT ... concludes that AIT has not met scientific standards for efficacy that would justify its practice by audiologists and speech-language pathologists.”
10. Rosenhall U, Nordin V, Sandström M, Ahlsén G, Gillberg C. Autism and hearing loss. Journal of Autism and Developmental Disorders. 1999;29(5):349–357. PMID 10587881. Checked October 10, 2026.
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    The abstract: “A group of 199 children and adolescents ... with autistic disorder was audiologically evaluated. Mild to moderate hearing loss was diagnosed in 7.9% ... Pronounced to profound bilateral hearing loss or deafness was diagnosed in 3.5% of all cases, representing a prevalence considerably above that in the general population”; “the rate of serous otitis media (23.5%) and related conductive hearing loss (18.3%) appeared to be increased in autistic disorder”; and “The study emphasizes the need for auditory evaluation of individuals with autism.”
11. Centers for Disease Control and Prevention. About Autism Spectrum Disorder. Page dated April 13, 2026. Checked October 10, 2026.
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    “Autism spectrum disorder (ASD) is a developmental disability caused by differences in the brain”; “ASD begins before the age of 3 years and can last throughout a person’s life ... Some children show ASD symptoms within the first 12 months of life. In others, symptoms may not show up until 24 months of age or later. Some children with ASD gain new skills and meet developmental milestones until around 18 to 24 months of age, and then they stop gaining new skills or lose the skills they once had”; “Diagnosing ASD can be difficult since there is no medical test, like a blood test, to diagnose the disorder”; and “By age 2 years, a diagnosis by an experienced professional can be considered reliable.”
12. Wilson WJ, Arnott W. Using different criteria to diagnose (central) auditory processing disorder: how big a difference does it make? Journal of Speech, Language, and Hearing Research. 2013;56(1):63–70. PMID 22761321. Checked October 10, 2026.
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    The abstract: a file review of “150 children (94 boys and 56 girls; ages 7.0-15.6 years) with normal peripheral hearing,” each classified against “9 different sets of diagnostic criteria”; “The rates of potential (C)APD diagnosis ranged from 7.3% for the strictest criteria to 96.0% for the most lenient criteria.”
13. Williams ZJ, Suzman E, Woynaroski TG. Prevalence of decreased sound tolerance (hyperacusis) in individuals with autism spectrum disorder: a meta-analysis. Ear and Hearing. 2021;42(5):1137–1150. PMID 33577214. Checked October 10, 2026.
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    The abstract: “Hyperacusis, defined as decreased tolerance to sound at levels that would not trouble most individuals, is frequently observed in individuals with autism spectrum disorder”; “67 were included in the review and synthesis”; the interview and questionnaire studies “estimated the current and lifetime prevalence of hyperacusis in ASD to be 41.42% ... and 60.58% ..., respectively”; and “a majority of individuals on the autism spectrum experiencing hyperacusis at some point in their lives.”
14. National Institute on Deafness and Other Communication Disorders. Auditory Processing Disorder. Last updated June 7, 2010. “Auditory processing disorder (APD) describes a condition in which people have trouble making sense of the sounds around them.” Checked October 10, 2026.
15. O’Connor K. Auditory processing in autism spectrum disorder: a review. Neuroscience & Biobehavioral Reviews. 2012;36(2):836–854. PMID 22155284. Checked October 10, 2026.
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    The abstract: “Findings show substantial evidence for atypical processing of auditory information in ASD at behavioural and neural levels”; and “auditory processing impairments in ASD are most likely to present during processing of complex auditory information and are more severe for speech than for non-speech stimuli.”
16. Centers for Disease Control and Prevention. Data and Statistics on Autism Spectrum Disorder. Page dated May 27, 2025. “About 1 in 31 (3.2%) children aged 8 years has been identified with ASD according to estimates from CDC’s ADDM Network”; and “ASD is over 3 times more common among boys than among girls.” Checked October 10, 2026.
17. Centers for Disease Control and Prevention. Signs and Symptoms of Autism Spectrum Disorder. Page updated May 16, 2024. Checked October 10, 2026.
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    Examples include “Avoids or does not keep eye contact,” “Does not respond to name by 9 months of age,” “Uses few or no gestures by 12 months of age (for example, does not wave goodbye),” “Does not point to show you something interesting by 18 months of age,” “Flaps hands, rocks body, or spins self in circles” and “Has unusual reactions to the way things sound, smell, taste, look, or feel”; restricted or repetitive behaviors and interests “set ASD apart from conditions defined by problems with social communication and interaction only.”
18. Centers for Disease Control and Prevention. Concerned About Your Child’s Development? Page dated February 17, 2026. Checked October 10, 2026.
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    “The American Academy of Pediatrics recommends that children be screened for general development using standardized, validated tools at 9, 18, or 30 months and for autism at 18 and 24 months or whenever a parent or provider has a concern”; specialists include “Developmental pediatricians,” “Child neurologists” and “Child psychologists or psychiatrists”; “call your state’s public early childhood system to request a free evaluation ... You do not need to wait for a doctor’s referral or a medical diagnosis to make this call”; under 3, “contact your local early intervention system”; from 3, “call any local public elementary school (even if your child does not go to school there).”
19. Iliadou VV, Ptok M, Grech H, et al. A European perspective on auditory processing disorder: current knowledge and future research focus. Frontiers in Neurology. 2017;8:622. PMID 29209272. Checked October 10, 2026.
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    The abstract: the disorder “defined as ‘Auditory Processing Disorder’ (APD) or ‘Central Auditory Processing Disorder’ is classified in the current tenth version of the International Classification of diseases as H93.25”; “APDs may have detrimental effects on the affected individual, with low esteem, anxiety, and depression, and symptoms may remain into adulthood. These disorders may interfere with learning per se and with communication, social, emotional, and academic-work aspects of life.”
20. Moore DR, Ferguson MA, Edmondson-Jones AM, Ratib S, Riley A. Nature of auditory processing disorder in children. Pediatrics. 2010;126(2):e382–e390. PMID 20660546. Checked October 10, 2026.
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    The abstract: “Randomly chosen, 6- to 11-year-old children with normal hearing (N = 1469) were tested in schools”; “sensory elements of perception were only weakly related to those performance measures”; “response variability in the AP tests, reflecting attention, and cognitive scores were the best predictors of listening, communication, and speech-in-noise skills”; and “We suggest that APD is primarily an attention problem.”
21. Centers for Disease Control and Prevention. Diagnosing ADHD. Page dated July 30, 2026. Checked October 10, 2026.
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    “There is no single test to diagnose ADHD, and many other problems ... can also have symptoms similar to ADHD”; “One step of the process involves having a medical exam, including hearing and vision tests, to rule out other problems with symptoms like ADHD”; and “The diagnosis can be made by a mental health professional, like a psychologist or psychiatrist, or by a primary care provider, like a pediatrician.”
22. Piller A, McHugh Conlin J, Glennon TJ, Andelin L, Auld-Wright K, Teng K, Tarver T. Systematic review of sensory-based interventions for children and youth (2015–2024). Frontiers in Pediatrics. 2025;13:1720179. Published November 12, 2025. “Occupational therapists are widely recognized as leaders in the evaluation and treatment of SI/SP challenges.” Checked October 10, 2026.
23. National Institute on Deafness and Other Communication Disorders. Ear Infections in Children. NIH Publication No. 10-4799, March 2013; last updated March 16, 2022. Checked October 10, 2026.
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    “Five out of six children will have at least one ear infection by their third birthday”; “Otitis media with effusion (OME) sometimes happens after an ear infection has run its course and fluid stays trapped behind the eardrum. A child with OME may have no symptoms”; and “Chronic otitis media with effusion (COME) happens when fluid remains in the middle ear for a long time or returns over and over again ... and also can affect their hearing.”
24. Rosenfeld RM, Shin JJ, Schwartz SR, et al. Clinical practice guideline: otitis media with effusion (update). Otolaryngology–Head and Neck Surgery. 2016;154(1 Suppl):S1–S41. PMID 26832942. Checked October 10, 2026.
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    The abstract: OME is “defined as the presence of fluid in the middle ear without signs or symptoms of acute ear infection”; clinicians “should obtain an age-appropriate hearing test if OME persists for 3 months or longer OR for OME of any duration in an at-risk child.”
25. de Wit E, Visser-Bochane MI, Steenbergen B, van Dijk P, van der Schans CP, Luinge MR. Characteristics of auditory processing disorders: a systematic review. Journal of Speech, Language, and Hearing Research. 2016;59(2):384–413. PMID 27082630. Checked October 10, 2026.
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    The abstract: in 48 studies, “Significant dissimilarities were found between children referred with listening difficulties and controls”; and “The listening difficulties of children with APD may be a consequence of cognitive, language, and attention issues rather than bottom-up auditory processing.”
26. Dawes P, Bishop D. Auditory processing disorder in relation to developmental disorders of language, communication and attention: a review and critique. International Journal of Language & Communication Disorders. 2009;44(4):440–465. PMID 19925352. Checked October 10, 2026.
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    The abstract: “the child who is regarded as having a specific learning disability by one group of experts may be given an APD diagnosis by another”; and “APD, as currently diagnosed, is not a coherent category, but that rather than abandoning the construct, we need to develop improved methods for assessment and diagnosis, with a focus on interdisciplinary evaluation.”
27. STAR Institute for Sensory Processing. Patterns or Subtypes of Differences in Sensory Integration & Processing. Undated web page. Checked October 10, 2026.
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    People with sensory over-responsivity “often have a ‘fight or flight’ response to sensation, e.g. being touched unexpectedly or loud noise” and “may try to avoid or minimize sensations, e.g. withdraw from being touched or cover their ears to avoid loud sounds.”
28. U.S. Department of Education. 34 CFR 300.8, Child with a disability. Electronic Code of Federal Regulations, up to date as of October 8, 2026. Checked October 10, 2026.
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    A child with a disability is one evaluated “as having an intellectual disability, a hearing impairment (including deafness), a speech or language impairment, a visual impairment (including blindness), a serious emotional disturbance ..., an orthopedic impairment, autism, traumatic brain injury, an other health impairment, a specific learning disability, deaf-blindness, or multiple disabilities” who needs special education; “Specific learning disability means a disorder in one or more of the basic psychological processes involved in understanding or in using language, spoken or written, that may manifest itself in the imperfect ability to listen, think, speak, read, write, spell, or to do mathematical calculations”; and “Speech or language impairment means a communication disorder, such as stuttering, impaired articulation, a language impairment, or a voice impairment, that adversely affects a child’s educational performance.”

Medical disclaimer. This page is for general educational purposes and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your child.