Alien Hand Syndrome, Strange Isn’t He?
Alien hand syndrome is an unusual neurological disorder, also known as “Dr. Strangelove syndrome“, whereby one of the sufferer’s hands seems to take a life of its own.
Alien hand syndrome typically results from brain trauma, after brain surgery, a brain aneurysm or a stroke. Other related conditions are foreign accent syndrome (in which people sound like they have a foreign accent when they didn’t have one before) and landmark agnosia (in which people become unfamiliar with large objects in familiar areas).
Source: The Mind’s Strange Syndromes