Let's talk about whether it's possible or not to forget your first language.
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In aphasia (sometimes called dysphasia),[a] a person may be unable to comprehend or unable to formulate language because of damage to specific brain regions.[2] The major causes are stroke and head trauma; prevalence is hard to determine but aphasia due to stroke is estimated to be 0.1–0.4% in the Global North.[3] Aphasia can also be the result of brain tumors, epilepsy, brain damage and brain infections, or neurodegenerative diseases (such as dementias).[4][5]

To be diagnosed with aphasia, a person's language must be significantly impaired in one (or more) of the four aspects of communication. Alternatively, in the case of progressive aphasia, it must have significantly declined over a short period of time. The four aspects of communication are spoken language production and comprehension, and written language production and comprehension, impairments in any of these aspects can impact on functional communication.

The difficulties of people with aphasia can range from occasional trouble finding words, to losing the ability to speak, read, or write; intelligence, however, is unaffected.[5] Expressive language and receptive language can both be affected as well. Aphasia also affects visual language such as sign language.[2] In contrast, the use of formulaic expressions in everyday communication is often preserved.[6] For example, while a person with aphasia, particularly expressive aphasia (Broca's aphasia), may not be able to ask a loved one when their birthday is, they may still be able to sing "Happy Birthday". One prevalent deficit in all aphasias is anomia, which is a difficulty in finding the correct word.[7]: 72 

With aphasia, one or more modes of communication in the brain have been damaged and are therefore functioning incorrectly. Aphasia is not caused by damage to the brain that results in motor or sensory deficits, which produces abnormal speech; that is, aphasia is not related to the mechanics of speech but rather the individual's language cognition (although a person can have both problems, as an example, if they have a haemorrhage that damaged a large area of the brain). An individual's language is the socially shared set of rules, as well as the thought processes that go behind communication (as it affects both verbal and nonverbal language). It is not a result of a more peripheral motor or sensory difficulty, such as paralysis affecting the speech muscles or a general hearing impairment.

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