There are two areas of the brain that seem to do a lot of the speech recognition and creation, they’re called Broca’s area and Wernicke’s area. The picture below shows you where they sit for your future ref. If you damage the bits associated with talking you can imagine why you might speak funny, but why a foreign accent and not just mumbo jumbo? Well this is where it gets even more interesting. What is actually happening is that these FAS sufferers are just saying certain bits of words differently, like mispronouncing the vowels or using slightly different intonation and we perceive that as a foreign accent. So it’s only our perception of what they sound like. In reality they are just making errors but we associate the errors with non-native English speakers.

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The following American lady, thanks to a stroke, has now got an “English” accent, sounds more Ozzy to me though.

https://www.youtube.com/watch?v=2RujUiV08jY

Lastly here’s another English lady who now sounds like she’s from elsewhere entirely. It’s part of a documentary called “My Strange Brain”, it’s well worth watching all of it, but here’s the section about FAS:

So, in answer to the question posed in the title, it would be proper rubbish.

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