Types of apraxia and rehabilitation
Apraxia is a neurological disorder that manifests as the inability to perform voluntary movements, despite having the necessary strength, coordination, and understanding. This condition, which affects motor planning, is not due to muscle weakness or sensory problems, but rather to dysfunctions in specific areas of the brain. There are various types of apraxia that can be treated with rehabilitation. Correctly identifying the type of apraxia is essential for establishing an effective and personalized rehabilitation treatment.
What is Apraxia?
Apraxia is often associated with injuries to the left hemisphere of the brain, especially the parietal or frontal cortex. It can occur after strokes, head injuries, neurodegenerative diseases such as Alzheimer's or Parkinson's, or in developmental disorders in children, such as childhood apraxia of speech.
According to Gonzalez Rothi et al. (1991), apraxia involves a disconnection between the intention of a motor act and its execution, which generates a significant alteration in the patient's daily life.
Types of Apraxia
Ideomotor Apraxia
This is the most common type and manifests when the patient has difficulty performing simple movements upon verbal command, even though they can do them spontaneously. For example, they cannot pretend to comb their hair when asked, but they can do so when looking in a mirror.
This form usually results from lesions in the left parietal region or the frontoparietal connection. Studies such as those by De Renzi et al. (1980) have demonstrated the relationship between this type of apraxia and difficulty imitating gestures or using objects symbolically.
Ideational Apraxia
It involves an alteration in the sequence of complex movements. The patient cannot correctly perform an action that requires multiple steps, such as making a cup of coffee. They may mix up the order or use objects incorrectly.
It has been linked to more diffuse lesions in the left hemisphere or involvement in the temporal and parietal lobes. This apraxia is common in advanced stages of dementia (Rumiati et al., 2001).
Apraxia of Speech
Also known as verbal apraxia, it affects the ability to plan the movements necessary for speaking. The person knows what they want to say, but cannot coordinate their speech muscles to do so.
It is common in children with neurodevelopmental disorders (childhood apraxia) or in adults following a stroke. It is associated with lesions in the premotor cortex or Broca's area. According to Wambaugh et al. (2006), intensive treatments focusing on repetition and auditory feedback offer significant improvements.
Constructional Apraxia
It makes it difficult to build, draw, or assemble objects, which is evident in tasks such as copying geometric figures. It is frequently observed in patients with right hemisphere injuries.
This form can be assessed with drawing or construction tests and is related to visuospatial rather than purely motor alterations (Lezak et al., 2004).
Dressing Apraxia
It refers to difficulty performing movements related to dressing, such as putting on a shirt or buttoning buttons. It is generally a result of injuries to the right hemisphere and can coexist with constructional apraxia.
Evaluation and Diagnosis
Diagnosing apraxia requires a complete neurological evaluation. The most commonly used tests include verbal command execution, gesture imitation, simulated use of objects, and drawing tests or functional tasks. Combining these with imaging studies (such as functional magnetic resonance imaging) allows for better localization of the lesion.
In the case of apraxia of speech, specific protocols are used such as Apraxia Battery for Adults or the Dynamic Evaluation of Motor Speech Skills (DEMSS) in children.
Apraxia Rehabilitation
Types of apraxia and rehabilitation. Apraxia rehabilitation should be tailored to the patient's type and needs. Here are some of the most relevant strategies according to the type of apraxia:
Occupational and Functional Therapies
Repetitive and functional training, with tasks of the daily life such as dressing, cooking, or writing, is essential. These interventions seek to retrain the brain through neuronal plasticity. Studies such as that of Smania et al. (2006) demonstrate the effectiveness of intensive practice in improving ideomotor and ideational apraxia.
Speech and Language Therapies
In apraxia of speech, speech therapists use techniques based on intensive repetition, modeling, and the use of visual or tactile cues. In children, programs such as PROMPT or DTTC have shown good results (Maas et al., 2008).
Technological Support and Virtual Reality
New technologies such as virtual reality and robotics are currently being incorporated to create controlled and motivating environments. Companies such as Inrobics, which develops rehabilitation software based on social robotics and artificial intelligence, is contributing to the advancement of personalized treatment for motor and cognitive disorders such as apraxia.
Cognitive-Motor Therapies
Integrating cognitive techniques (such as movement visualization or mental planning) with physical tasks can improve motor performance. This approach is particularly useful in ideational apraxia.
Conclusion
Apraxia is a complex disorder that requires a multidisciplinary therapeutic approach. Understanding the different types of apraxia helps guide diagnosis and design personalized treatments. Thanks to scientific and technological advances, increasingly more tools are available to improve the quality of life of those affected. Early, intensive, and patient-centered rehabilitation is key to maximizing functional recovery.
