ELI5 Amnesia - why don’t people forget their primary language?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

How realistic are the Hollywood movie portrayals of amnesia compared to real-life amnesia? Why is it that when people get amnesia, they don't forget everything? Why do people with amnesia not forget their primary language for example? What’s the difference between retrograde and anterograde amnesia? Is there anything that can be done to treat or manage amnesia? Is it possible to ‘fake’ amnesia?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: favoritecolorsreddit, jowwill, stuartgotz, dildingo, rosemourne, cerberus73, wzup, untenabell, faelyn42 and omegaprimus

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