Aphasia

Aphasia is a disruption to an area of the brain that causes damage to parts of the brain that deal with langauge. These are most commonly seen in stroke patients. Aphasia directly affects how a person communicates and comprehends language, but does not have any impact on their intelligence levels. In some areas of the brain, this causes a disruption in written and verbal skills, whether that is having difficulty speaking or difficulty in comprehending what is said. Those diagnosed with aphasia are likely to demonstrate trouble speaking, difficulty finding the appropriate term or word, and using strange or uncomprehensible words when speaking. 
Aphasia is typically caused by stroke, brain injuries, brain tumors, brain infections or dementia, such as Alzheimer's disease. In some cases, aphasia is a symptom of epilepsy or a neurological disorder. 
There are many different types of aphasia, however we will focus on the receptive and expressive types, respectuflly known as Wernicke's and Broca's aphasia.