Apraxia

Overview

Apraxia is a disorder of motor planning. People with apraxia know what they want to do and have the muscle strength to do it, but the brain cannot reliably organize and sequence the movements needed to carry out the task. For example, a person may be unable to wave goodbye on command yet wave spontaneously a moment later, or struggle to position the lips and tongue to say a familiar word.

Apraxia results from damage to the parts of the brain involved in coordinating movement, most often in the left hemisphere. It is different from weakness or paralysis, and different from problems with understanding language, although it often occurs alongside those issues. There are several forms, including apraxia of speech, limb apraxia, and oral (buccofacial) apraxia, each affecting different types of action.

Symptoms

The signs depend on which type of apraxia is present and how severe it is. Common features include:

• Difficulty performing tasks on request even though the same action may happen automatically.
• Groping or fumbling movements as the person searches for the correct position or sequence.
• Inconsistent errors, so a task is done correctly one time and not the next.
• Speech that is effortful, slow, or distorted, with sounds substituted or left out, in apraxia of speech.
• Trouble using everyday objects such as a comb, toothbrush, or key, even when the person recognizes them.
• Difficulty imitating gestures or following step-by-step instructions for a movement.

Frustration is common because the person is aware of the mismatch between what they intend and what their body does.

Causes

Apraxia is caused by damage or disruption to the brain regions that plan and sequence movement, particularly the frontal and parietal lobes of the dominant hemisphere. Common causes include:

• Stroke, the most frequent cause in adults.
• Traumatic brain injury.
• Brain tumors affecting motor-planning areas.
• Neurodegenerative diseases such as some forms of dementia and certain Parkinson-related disorders.
• Infections or inflammation of the brain.

A distinct form, childhood apraxia of speech, is present from early development. Its exact cause is often unknown, though it can be linked to genetic conditions or differences in brain development rather than an acquired injury.

Risk Factors

Anything that raises the risk of brain injury increases the chance of acquired apraxia. These include:

• A history of stroke or conditions that raise stroke risk, such as high blood pressure and atrial fibrillation.
• Previous traumatic brain injury.
• Progressive brain conditions, including dementia and Parkinson disease.
• Brain tumors or surgery involving motor-planning regions.

In children, a family history of speech and language disorders may be associated with childhood apraxia of speech.

Diagnosis

Diagnosis usually involves a combination of clinical assessment and testing to rule out other causes such as muscle weakness or language comprehension problems. Steps may include:

• Speech-language evaluation, in which a speech-language pathologist asks the person to perform movements, imitate gestures, and produce sounds and words to identify the pattern of difficulty.
• Occupational therapy assessment of how the person uses objects and carries out daily tasks.
• Neurological examination to check strength, coordination, reflexes, and sensation.
• Brain imaging such as MRI or CT to look for stroke, tumor, or other damage.

Because apraxia frequently occurs with other conditions, careful testing helps separate motor-planning problems from weakness, sensory loss, or language disorders.

Treatment

There is no medication that cures apraxia. Treatment centers on rehabilitation therapy, tailored to the type and severity of the disorder, and on managing the underlying cause.

• Speech therapy for apraxia of speech uses repeated practice of sounds and words, slowing speech, and techniques that pair movement with visual or touch cues.
• Occupational therapy helps relearn daily activities through structured, repeated practice and adapting tasks or the environment.
• Physical therapy may support limb apraxia by rehearsing functional movements.
• Communication aids, such as gestures, picture boards, or devices, can help when speech is severely affected.

Recovery is often gradual. Improvement depends on the cause, the area and extent of brain damage, the person's overall health, and the intensity of therapy. Some people recover substantially, while others learn strategies to work around lasting difficulty.

Prevention

Apraxia itself cannot always be prevented, but reducing the risk of the brain injuries that cause it can help. Useful steps include:

• Managing blood pressure, cholesterol, and diabetes to lower stroke risk.
• Not smoking and limiting alcohol.
• Wearing seatbelts and helmets and taking precautions to prevent falls and head injury.
• Treating conditions such as atrial fibrillation that can lead to stroke.

Early rehabilitation after a stroke or brain injury may improve outcomes when apraxia does occur.

When to See a Doctor

Seek emergency care immediately if apraxia or any new difficulty with movement or speech comes on suddenly, especially with face drooping, arm weakness, slurred speech, sudden confusion, or severe headache. These can be signs of a stroke, where fast treatment can save brain tissue.

Make a non-urgent appointment if you notice a gradual, persistent decline in the ability to carry out familiar movements or speak clearly, or if a child has ongoing trouble producing speech sounds. Early evaluation and therapy give the best chance of meaningful improvement.

Related Topics

Frequently Asked Questions

References

1. National Institute of Neurological Disorders and Stroke (NINDS).
2. American Speech-Language-Hearing Association (ASHA).
3. MedlinePlus, U.S. National Library of Medicine.
4. Mayo Clinic. Apraxia of speech.