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anonymoussarcasm t1_j699ry3 wrote

It has more to do with the phonetic positioning of the tongue when pronouncing vowels and consonants. Head trauma can effect the cranial nerves which control the mouth, throat and tongue. The different between accents in the same language is principally due to the positioning and manipulation of these structures. So it isn't that they develop an authentic foreign accent, more that they misalign their speech producing anatomy and the misalignment produces an effect which is heard as foreign to the listener.

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