Another interesting article regarding the subject that explains that my English accent may come out when I/m slightly more manic and it makes sense.

http://www.currentpsychiatry.com/spe...9eef8924c.html

"Foreign accent syndrome
A foreign accent can be acquired by normal phenomena, such as being immersed in a foreign language, or a pathological process, 1 which can include psychiatric (functional) or neurologic illness (organic causes). Foreign accent syndrome (FAS) is a rare speech disorder characterized by the appearance of a new accent, different from the speaker’s native language, that is perceived as foreign by the listener and in most cases also by the speaker. 2 Usually an FAS patient has had no exposure to the accent, although in some cases an old accent has re-emerged. 3,4
FAS can result from lesions in brain areas involved in speech production, including precentral gyrus, premotor mid-frontal gyrus, left subcortical prerolandic gyrus, postrolandic gyri, and left parietal area. 4 Most FAS cases are secondary to a structural lesion in the brain caused by stroke, traumatic brain injury, cerebral hemorrhage, or multiple sclerosis. 2 There are a few cases in the literature of acquired foreign accent with psychogenic etiology in patients with schizophrenia and bipolar disorder with psychotic features. "