Our brain is a very complex organ which has so many parts and portions, all having vital roles. One such portion is Posterior Parietal Cortex (PPC) which plays an important role in planned moments, reasoning, and attention.
Some damage in PPC can lead to consequences such as apraxia and hemispatial neglect. However, in this article, we’ll focus only on Apraxia.
What is Apraxia?
It is another motor disorder caused due to some damage to the brain, especially to PPC. It affects the nervous system in such a way that brain loses its ability to plan, to coordinate and to perform some given tasks. It’s not that brain doesn’t understand command or request but:
- The request or command is understood.
- The person wants to do the task but can’t because of lack of coordination and mapping.
For example, if you’ll ask a patient to act as if he/she is unlocking a door with a key so he/she will be unable to act so though they had full information how to do it.
There are several types of it such as conceptual, Ideomotor apraxia.
Depending on severity and behaviour there are many types, some of them are:
- Ideomotor apraxia: Patient of this type have deficits in their ability to perform a task which includes day to day knowledge or facts such as pretend to brush teeth.
- Conceptual apraxia: In this type patients face problem in properly mapping and executing a complex plan. Moreover, they may also have some problem in doing tasks which include the use of tools or otherwise interacting with objects in everyday life. For example, a patient may mistake a screwdriver as a pen.
- Constructional apraxia: In this type the patients face inability or difficulty to build, assemble, or draw objects.
- Apraxia of speech: In this type, the patients find it difficult to plan and to coordinate the movements necessary for speech. For example, they may pronounce potato as totapo.
Damage to not only PPC but to any other dominant hemisphere of the brain can cause it. However, sometimes, it comes as the side effect of several other disease or disorders. Such as Huntington’s disease, Alzheimer’s disease, or any other neurodegenerative diseases. Although the probability of developing it is less when damage in on non-dominant hemisphere and on other portion but still it can cause apraxia.
The damage may cause due to strokes, brain injuries, or neurodegeneration.