Foreign accent syndrome (FAS) refers to the occurrence of a foreign-sounding accent in the speech of a person usually following known neurological insult such as a stroke or traumatic brain injury. In the strict sense, the acquired accent is not the result of previous exposure to a foreign language. In fact, detailed studies have shown it is not a true foreign accent, but rather a constellation of foreign-sounding speech features. In this respect, it is more like a generic foreign accent than one of a particular foreign language. More recent studies have suggested that it can also arise from adverse allergic reactions to medicines, from neurotoxins, and as a side of effect of severe migraine (especially hemi or one-sided migraine). It is possible that this ...

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