In the left hemisphere of the brain, there are two main areas in our brain that mainly deal with speech processing. The first one, located in the frontal lobe, is called Broca's area. The second one, located in the temporal lobe, is called Wernicke's area. Now, when you hear the term aphasia, it refers to the loss in the ability to speak or to understand speech. There are two types of aphasia, each dealing with the two area's described above. Wernicke's aphasia is a fluent aphasia, or in other words, it causes people to have senseless and non-stop speech. Wernicke's aphasia can be caused by a stroke. On the other hand, Broca's aphasia deals with the loss of the ability to produce spoken and/or written language. Someone with Broca's aphasia cannot speak or write in any language. Have you ever had the feeling when you are trying to say something but cannot think of the word? Well, that is, more or less, the constant feeling patients with Broca's aphasia have; they cannot think of any word to express what they want to say. Be sure to check out the videos listed below, they are extremely interesting!
Here is a video of patients with wernicke's aphasia and how they talk:
Here is video of patients with Broca's aphasia:
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