foreign accent syndrome
An über rare condition caused by a severe stroke or head injury (2 cases have been reported of individuals as a development problem), in which the person’s normal speech and inflections undergo an abrupt change, such that they sound like they’re native to another language, country or culture.
The accent is attributed to distorted articulatory planning and coordination processes. In 2008, Cindy Lou Romberg of Port Angeles, Washington, who had suffered a brain injury 17 years earlier, developed foreign accent syndrome after a neck adjustment from her chiropractor. A visit to the hospital ruled out a stroke. Afterwards she spoke with a Russian accent and even appeared to make the grammatical mistakes of a Russian speaking English, as if English was not her native language.