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There's a few medical cases where patients with head injuries seemed to speak with a foreign accent afterwards. Sometimes it's because they spoke that foreign language growing up, and they've damaged the part of their brain that mastered their new accent and regressed back to an earlier mental state; sometimes it's because they've just acquired a certain speech impediment that happens to sound like a Dutch accent or whatever... I dimly recall that there was a case of this sort of thing floating around the news recently, I imagine that's where he got the reference.
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