why do people with amnesia not forget their primary language?

Question

why do people with amnesia not forget their primary language?

In: 146

Answer 1

Anectode:

My grandmother was Danish, but moved to Norway when she married grandpa. Over time, her language became increasingly Norwegian and decreasingly Danish though she always had an accent. The two languages are mostly mutually intelligible, but very noticeably different.

Then, in her 90’s, she had a stroke and immediately reverted to fluent Danish without a trace of Norwegian accent. And then her language changed back to Norwegian again over a few days.

Language is weird, brains are weird.