What is the definition of, “Alien Hand Syndrome”?”
Alien hand syndrome: The feeling that one’s hand is possessed by a force outside of ones control. The syndrome typically arises after trauma to the brain, after brain surgery or after a stroke or an infection of the brain. A person with the alien hand syndrome can feel sensation in the affected hand but thinks that the hand is not part of their body and that they have no control over its movement, that it belongs to an alien. Different types of brain injuries cause different subtypes alien hand syndrome. For example, take an injury to the corpus callosum (the area of the brain which connects the two cerebral hemispheres, the two halves of the brain). Such an injury in a right-handed person can give rise to purposeful movements of the left hand, while injury to the brain’s frontal lobe of the brain can trigger grasping and other purposeful movements in the dominant right hand. More complex hand movements such as unbuttoning or tearing of clothes are usually associated with brain tumors,
Alien hand syndrome (anarchic hand or Dr. Strangelove syndrome) is an unusual neurological disorder in which one of the sufferer’s hands seems to take on a mind of its own. Sufferers feel that they have no control over the movements of the ‘alien’ hand, but that, instead, the hand has the capability of acting autonomously–i.e. independent of their voluntary control. AHS is best documented in cases where a person has had the two hemispheres of their brain surgically separated, a procedure sometimes used to relieve the symptoms of extreme cases of epilepsy. It also occurs in some cases after other brain surgery, strokes, or infections An alien hand sufferer can feel normal sensation in the hand and leg, but believes that the hand, while still being a part of their body, behaves in a manner that is totally distinct from the sufferer’s normal behavior. They lose the ‘sense of agency’ associated with the purposeful movement of the limb while retaining a sense of ‘ownership’ of the limb.
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