Apraxia is a side effect of brain damage that causes difficulty with coordinating muscle movements.
Apraxia can manifest in a number of different ways, depending on where the brain damage occurred. The most common type of apraxia is apraxia of speech, which affects the orofacial muscles.
This article will explain the different causes and types of apraxia after brain injury, plus some helpful treatments.
Causes of Apraxia After Brain Damage
Apraxia is a motor disorder that causes problems with motor planning. In other words, it makes it difficult for a person to perform complex tasks that require coordination of diverse muscle groups.
It differs from other movement disorders in that the person can understand what movements they must make, they just cannot perform them.
Apraxia is caused by damage to the parts of the brain responsible for muscle movement and coordination, particularly the cerebellum and the posterior parietal cortex.
These parts are in charge of directing which muscles should activate and which need to relax. They do this by sending inhibitory or excitatory signals to the right muscle groups.
For example, to pick up a fork, you must extend your arm first, which means your bicep muscle cannot fire while this is happening. Otherwise, your arm would just contract. The brain, therefore, will send signals to your bicep, telling it to relax. This allows you to extend your arm easily.
However, if these brain regions become damaged, this process is disrupted, which will make muscle coordination difficult, if not impossible.
Types of Apraxia Following Brain Damage
There are several different types of apraxia that can develop after brain injury, and these types can occur together or separately. The type of apraxia that develops depends on which part of the brain sustains damage. For example, damage to the basal ganglia will cause a different type of apraxia than damage to the primary motor cortex would.
Some of the most common types of apraxia include:
- Limb-kinetic Apraxia: This type refers to the inability to make fine, precise movements with your arms or legs.
- Ideomotor Apraxia: This causes difficulties in performing the proper movements in response to a verbal command.
- Ideational Apraxia: The inability to coordinate activities with multiple, sequential parts such as dressing, eating, bathing, and other activities of daily living.
- Verbal Apraxia: Also known as apraxia of speech, this type causes difficulties with coordinating facial movements to form words.
- Oculomotor Apraxia. Finally, apraxia can also affect the eye muscles themselves, making it difficult to move the eyes correctly.
Fortunately, all of these types of apraxia can be effectively treated through speech and occupational therapy.
Symptoms of Apraxia
Symptoms of apraxia will look different based on which muscles are affected. For example, a person with apraxia in their legs often takes wide, staggering steps. If their arms are affected, they may make zigzagging movements with their arms and struggle to pick up objects.
For apraxia of speech in particular, symptoms can include:
- Exaggerated movements of the lips and tongue (called groping)
- Slowed speech
- Distortion of vowel sounds
- Difficulty stringing syllables together
- Incorrect inflections
- Omitting consonants at the beginning and end of words
Apraxia of speech is often accompanied by aphasia, a language disorder. However, apraxia itself does not cause problems with speech comprehension or production.
Treating Apraxia of Speech After Brain Damage
Apraxia is a result of poor communication between the brain and the muscles. Because of the damage that has occurred, the signals that the brain sends to coordinate movements do not reach the correct muscles.
Therefore, to treat apraxia of speech, patients must improve communication between their brain and the rest of the body. Fortunately, you can accomplish this by activating your brain’s natural repair mechanism, neuroplasticity. The best way to do this is through repetitious exercise.
When you practice a task, even if you can’t do it perfectly, your brain forms new neural pathways in response. After enough time and practice, the new pathways will be fully established and the connection to your muscles will return. This will allow you to coordinate movement again.
This technique will work with all types of apraxia. Since, however, apraxia of speech is most common, we will show you a few speech therapy exercises that you can do at home.
Exercises for Apraxia of Speech
The best way to overcome apraxia of speech is to work with an expert called a Speech Language Pathologist. These experts are specifically trained to improve disorders related to brain injuries.
In between therapy sessions with your SLP, it’s a good idea to practice speech therapy exercises on your own at home.
Here are some examples of exercises for apraxia of speech:
Lip articulation exercises
This first set of exercises will improve your lip control. Some of the best exercises for this include:
- Make the sound “ooo” while forming your lips into an O shape. Then say “eee” while forming your lips into a smile. Finally, combine the two and say “ooo-eee.” Repeat 10 times.
- Next say “puh” and try to make a popping sound with your lips.
- For this exercise, just simply sip some water through a straw. Drinking through a straw requires coordinated movement between your lips, cheeks, and tongue, which makes it a great activity for apraxia patients.
Tongue articulation exercises
These exercises will help you regain better control of your tongue. A few activities that a speech therapist might suggest include:
- Place the tip of your tongue right behind your upper front teeth. Hold it there as long as you can.
- Say “lalalala” without moving your jaw. Only move the tip of your tongue. Rest and repeat 10 times.
- Form an O shape with your lips. Then, place your tongue on the left corner of your lip and trace it all the way around your lips. When you complete the circle five times, switch to the other direction.
Once you have practiced enough articulation exercises, you can now combine your skills together and practice coordination. Some coordination exercises you can use are:
- Say “buttercup” 5 times in a row, then say “rocket ship” 5 times. These words work your lips, the tip of your tongue, and the back of your tongue.
- Say “puh, tuh, kuh” three times. You can start slow, but try to gradually increase your speed.
These exercises will get you started on your way to overcoming apraxia.
Understanding Apraxia After Brain Damage
Apraxia is a motor disorder that makes it difficult to perform purposeful movements, such as speech. It occurs after damage to parts of the brain in charge of motor control.
By engaging neuroplasticity through exercise, however, it is possible to treat apraxia and regain full control of your muscles.
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