This is a video from Discovery Channel about Alien-Hand Syndrome. Enjoy!

Current research about Alien Hand Syndrome:

Led by Frederic Assal of University Hospital in Geneva, Switzerland, researchers conducted a study of a 70-year-old right-handed man who had AHS after suffering a large stroke in the right parietal lobe. His left hand had normal motor function, with only slight weakness and clumsiness, but showed marked sensory loss. His alien movements consisted of involuntary gestures or grasping with his left hand, which he sometimes did not notice due to mild left visual neglect (a condition in which the patient is unaware of events in the left visual field even though the visual pathways are intact) as a result of the stroke. The researchers performed two functional MRI experiments in which the patient performed simple motor tasks that allowed them to compare similar left-hand movements executed both consciously and unconsciously.

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