The reasons aphasia impacts language
According to Verywell Mind, the dominant hemisphere of the brain, typically the side of the brain opposite a person’s dominant hand, commands language function. Within the dominant hemisphere of the brain, there are several parts that contribute to language capabilities. There is the frontal lobe, which controls cognitive functions, the parietal lobe, which governs sensory perception, and the temporal lobe, which controls the processing of memories and contains the primary auditory cortex (via Science Direct).
When aphasia is a result of damage to the temporal lobe, a person is usually diagnosed with a form of fluent aphasia (per Centre for Neuro Skills). A common sign of fluent aphasia is when a person will say long sentences with seemingly random words. If the brain damage occurs in the frontal lobe, then a person is likely to be diagnosed with a form of non-fluent aphasia, which is noticeable when a person can say short, coherent sentences but produces them with a great deal of effort. Within fluent and non-fluent aphasia, there are numerous specific types of aphasia depending on exactly where the brain damage has occurred. Medical tests and imaging can help determine exactly where brain damage has occurred.