Apraxia of Speech

What apraxia of speech is

Speaking requires the brain to send a precise, rapid sequence of commands to dozens of muscles. In apraxia of speech, that motor planning is disrupted. The muscles work normally for other tasks such as chewing and smiling, but the person cannot reliably produce the right sequence for speech. They know exactly what they want to say; the difficulty is getting the mouth to do it.

This makes it different from:

Apraxia and aphasia often occur together after a stroke.

Childhood apraxia of speech (CAS)

CAS is uncommon, affecting roughly 1 to 2 children per 1,000. It is more common in boys.

Signs in babies and toddlers

• little cooing or babbling as a baby
• late first words, and a small number of sounds and words
• words that appear and then seem to disappear

Signs in preschool and older children

• inconsistent errors: the same word is said differently each time
• difficulty moving between sounds and syllables: long words are harder than short ones
• groping: visible effort as the child tries to position the lips and tongue
• unusual rhythm and stress: speech sounds choppy, robotic or monotone, or stresses the wrong syllable
• vowel distortions
• understanding language much better than they can speak
• difficulty imitating words on request, though automatic phrases may come out more easily

Children with CAS may also have language delays, fine motor clumsiness, and later difficulties with reading and spelling.

Causes

Most cases have no known cause. CAS can be associated with:

• genetic conditions, including changes in the FOXP2 gene and some chromosome differences
• autism, cerebral palsy, galactosemia and some epilepsy syndromes
• metabolic and neurodevelopmental disorders

Acquired apraxia of speech in adults

In adults, apraxia of speech results from damage to the speech-planning areas in the left side of the brain. Causes include:

• stroke, the most common cause
• traumatic brain injury
• brain tumors and surgery
• primary progressive apraxia of speech, a degenerative condition in which speech planning gradually worsens; it may later develop into a broader neurodegenerative disease

Adults typically speak slowly with effort, make inconsistent sound errors, grope for mouth positions, and repeatedly try to correct themselves. Speech often has abnormal rhythm and can sound like a foreign accent.

Diagnosis

A speech-language pathologist (SLP) diagnoses apraxia of speech by:

• listening to spontaneous speech and asking the person to repeat sounds, syllables, words and sentences of increasing length
• checking how consistent errors are
• examining mouth structure and non-speech movements (blowing, licking lips)
• assessing language understanding and expression
• in children, often observing over several sessions, because CAS can be hard to confirm in toddlers under 2 to 3

Children should also have a hearing test. Adults need a neurological assessment and usually an MRI to identify the cause. Genetic testing may be offered for children with CAS and other developmental concerns.

Treatment

Speech therapy

Speech therapy is the core treatment for both children and adults. Effective approaches:

• are frequent and intensive: short sessions several times a week work better than one long weekly session
• focus on movement practice: many repetitions of syllables and words, with feedback, rather than just listening
• use multisensory cues: touch cues on the face, visual cues and rhythm
• build gradually from simple sound combinations to longer words and phrases

Programs with evidence include Dynamic Temporal and Tactile Cueing (DTTC), Rapid Syllable Transition Treatment (ReST) and the Nuffield Dyspraxia Programme for children, and sound production treatment for adults.

Practice at home

Families are key: daily practice of target words in play and routines, reading aloud together and celebrating attempts helps progress.

Augmentative and alternative communication (AAC)

Sign language, picture boards and speech-generating devices or apps let people communicate while speech develops. Using AAC does not stop children from learning to talk; it often reduces frustration and supports language.

Outlook

Children with CAS usually improve substantially with consistent, intensive therapy, though it typically takes longer than other speech disorders, often years. Many achieve clear, functional speech. Adults with apraxia after a stroke often improve, especially in the first months, and therapy continues to help after that. Primary progressive apraxia of speech worsens over time, and therapy and AAC focus on maintaining communication.

Frequently asked questions

What is apraxia of speech?

Apraxia of speech is a motor speech disorder in which the brain has difficulty planning and coordinating the movements needed to speak. The person knows what they want to say and the muscles are not weak, but sounds and words come out inconsistently or with effort.

What are the signs of apraxia in toddlers?

Signs include limited babbling as a baby, late and few first words, losing words they had, using only a few sounds, struggling to imitate words, and understanding much more than they can say. A speech-language pathologist can assess concerns.

What is the difference between apraxia and dysarthria?

Apraxia is a problem planning speech movements, with inconsistent errors and visible groping. Dysarthria is weakness or poor control of the speech muscles, causing consistent slurred or slow speech, often with swallowing difficulties. Both can follow a stroke.

Can a child outgrow apraxia of speech?

Children do not usually outgrow CAS without help, unlike a simple speech delay. With frequent, intensive speech therapy, most make good progress, and many reach clear, understandable speech, although some have lasting subtle differences.