Imagine being attacked by one of your own hands, which repeatedly tries to slap and punch you. Or you go into a shop and when you try to turn right, one of your legs decides it wants to go left, leaving you walking round in circles.
Last summer I met 55-year-old Karen Byrne in New Jersey, who suffers from Alien Hand Syndrome. Her left hand, and occasionally her left leg, behaves as if it was under the control of an alien intelligence.
Karen's condition is fascinating, not just because it is so strange but because it tells us something surprising about how our own brains work.
It started after Karen had surgery at 27 to control her epilepsy, which had dominated her life since she was 10.
Surgery to cure epilepsy usually involves identifying and then cutting out a small section of the brain, where the abnormal electrical signals originate.
When this does not work, or when the damaged area cannot be identified, patients may be offered something more radical. In Karen's case her surgeon cut her corpus callosum, a band of nervous fibres which keeps the two halves of the brain in constant contact.
Watch video at the source below ...
Alien Hand Syndrome sees woman attacked by her own hand
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