What Is Apraxia Of Speech Causes Types Treatment?

Apraxia of speech is a motor speech disorder where the brain struggles to plan and coordinate the movements needed for speech. It is not a muscle weakness or paralysis; the problem lies in the brain’s ability to send the correct signals to the lips, jaw, and tongue. Treatment typically involves intensive speech therapy focused on repetitive practice of speech movements, and the two main types are childhood apraxia of speech (CAS) and acquired apraxia of speech (AOS), each with different causes.

What Exactly Happens in the Brain With Apraxia of Speech?

Think of speech as a complex sequence of instructions. Your brain has to plan which muscles to move, in what order, and with what timing. In apraxia of speech, the brain knows what it wants to say. But the motor planning pathways that turn that thought into precise movements are disrupted.

Research published by the National Institute on Deafness and Other Communication Disorders (NIDCD) shows that the damage or developmental difference is often in the left hemisphere of the brain, specifically areas involved in motor planning for speech. This is not the same as aphasia, which is a language disorder affecting word finding or grammar. A person with apraxia may have perfect language skills but cannot consistently produce the correct sounds.

One common sign is inconsistency. A person might say a word correctly once and then struggle with it the next time. This is because the brain is not reliably sending the same motor plan each time.

What Causes Apraxia of Speech in Children and Adults?

The causes differ sharply between the two main types of apraxia of speech. Childhood apraxia of speech (CAS) is present from birth and is not caused by injury or illness. Its exact cause is often unknown, though research points to genetic factors. Some studies have identified specific genes, like FOXP2, that are linked to CAS. It can also occur as part of a broader genetic syndrome or neurological condition.

Acquired apraxia of speech (AOS) happens after a person has already developed speech. The most common cause is a stroke, particularly one affecting the left hemisphere of the brain. Traumatic brain injury, brain tumors, and progressive neurological diseases like primary progressive aphasia can also cause AOS.

It is important to note that apraxia of speech is not caused by emotional problems, poor parenting, or lack of intelligence. This misconception can delay proper diagnosis and treatment.

What Are the Different Types of Apraxia of Speech?

There are two main types of apraxia of speech. Understanding which type a person has is critical because the treatment approaches and outlook can be very different.

A third, less common form is progressive apraxia of speech, which occurs as part of neurodegenerative conditions. In this case, the ability to plan speech movements slowly worsens over time. This is distinct from the sudden onset seen after a stroke.

Childhood apraxia of speech is sometimes called developmental verbal dyspraxia. Acquired apraxia of speech may also be referred to as verbal apraxia or dyspraxia. These names all describe the same core problem: difficulty with speech motor planning.

What Are the Signs and Symptoms of Apraxia of Speech?

The symptoms vary by person and severity, but some patterns are common. In children, parents might notice that the child did not babble as a baby. First words may come late. The child might understand everything you say but struggle to respond. They may make inconsistent errors, saying a word correctly one day and differently the next.

Other signs in children include:

• Distorting sounds, especially vowels
• Groping movements of the mouth when trying to speak
• Difficulty stringing syllables together
• Inappropriate stress on syllables or words
• More trouble with longer or more complex words

In adults with acquired apraxia, the symptoms appear suddenly after a brain event. They may know exactly what they want to say but produce sounds that are off target. They might speak slowly, with long pauses between sounds. Groping for the right mouth position is common. Unlike aphasia, the person can often write their thoughts down correctly.

A key distinction is that apraxia of speech is not about muscle weakness. A person with apraxia can usually move their lips and tongue normally for eating or smiling. The problem is specific to the voluntary, coordinated movements required for speech.

How Is Apraxia of Speech Diagnosed?

Diagnosis is made by a speech-language pathologist (SLP). There is no single blood test or brain scan that confirms apraxia of speech. The SLP will take a detailed history and perform a series of speech tasks to evaluate motor planning abilities.

The SLP will look for the hallmark signs: inconsistent errors, difficulty with sound sequencing, and groping behaviors. They will rule out other conditions like dysarthria (muscle weakness) or aphasia. For children, the diagnosis often happens after a period of speech therapy. If a child does not improve as expected with standard articulation therapy, apraxia is suspected.

The American Speech-Language-Hearing Association (ASHA) provides guidelines for diagnosing CAS. These include observing the child’s speech for three core features: inconsistent errors on consonants and vowels, lengthened and disrupted transitions between sounds, and inappropriate prosody (rhythm and stress).

For adults, the diagnosis is often clearer because the onset is sudden and linked to a known brain injury. The SLP will assess the person’s ability to repeat words and sentences, comparing their performance to what would be expected for their age and education level.

What Is Apraxia Of Speech Causes Types Treatment: What Actually Works?

The primary treatment for both types of apraxia of speech is speech therapy. There is no medication or surgery that can fix the motor planning problem. The brain must learn or relearn how to plan and execute speech movements.

For childhood apraxia of speech, the most effective therapies are based on motor learning principles. This means high repetition of specific speech movements. The child practices the same sound or word many times in a structured way. The goal is to build a stable motor plan that the brain can reliably use.

Some specific therapy approaches with evidence behind them include:

• Dynamic Temporal and Tactile Cueing (DTTC): The therapist provides intensive cues, including tactile prompts, to help the child produce sounds correctly.
• Rapid Syllable Transition Treatment (ReST): Focuses on practicing non-words to improve the ability to sequence sounds quickly.
• Integrated Phonological Awareness Intervention: Combines speech work with reading readiness skills.

For acquired apraxia of speech, therapy focuses on relearning the motor plans for speech. The SLP may use visual cues, like watching a mirror, or auditory cues, like listening to a recording of the target word. Repetition is key. Some research supports the use of melodic intonation therapy, which uses the musical elements of speech to bypass damaged areas of the brain.

Evidence indicates that therapy works best when it is intensive. Sessions three to five times per week are common for children. For adults, the frequency depends on their overall health and stamina. Progress is often slow and requires persistence from the person and their family.

What Are Common Misconceptions About Apraxia of Speech?

One widespread myth is that children with apraxia will simply grow out of it. This is not true. Without intervention, the underlying motor planning problem does not resolve on its own. Early, intensive therapy gives the best chance for significant improvement.

Another misconception is that apraxia of speech is the same as a language delay. A child with a language delay has trouble understanding or using words. A child with apraxia understands language perfectly but cannot coordinate the movements to speak. These are different problems requiring different treatments.

Some people believe that using sign language or an augmentative communication device will prevent a child from learning to talk. Research does not support this. In fact, giving a child a way to communicate reduces frustration and can support speech development. It takes the pressure off and allows the motor system to practice without the stress of being misunderstood.

For adults, there is a misconception that if they cannot speak, they have also lost their intelligence. This is rarely true. Apraxia of speech affects output, not cognitive ability. The person is still the same person inside.