What’s happening when someone wakes up from surgery/a coma/head injury and knows a different language? How would it be possible for someone to materialize knowledge of all that vocabulary, and sentence structure?
My understanding is this has happened in rare incidents, however the person is already bilingual. Damage to some areas of the brain cause them to not be able to speak one of them. They do not suddenly gain an entire language, but sever brain damage makes them Lose one.
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