You may have heard it called anarchic hand syndrome. It’s a very rare condition in which part of the body—commonly a hand—seems to move with a mind of its own. The movements caused by AHS are different from the tics associated with Tourette’s because they always seem to have a purpose.
For example, a hand affected by AHS might reach out and grab a cup of tea without its owner knowing. It might pet a cat or touch a piece of artwork without permission. It might even withhold something its owner wants or, in some cases, attack the body it’s connected to.
What causes AHS? In many cases, it starts after a patient has surgery on a part of their brain called the corpus callosum. The nerves in this region help the two sides of the brain communicate with each other. Rarely, AHS is caused by stroke, trauma to the brain, or cancer.
Some experts believe the movements associated with AHS originate in the brain. But due to changes in the corpus callosum, different parts of the organ aren’t communicating with each other. That’s why the person doesn’t realize they’re moving.
Is there a cure for AHS? Not yet. Many people find it helpful to give their affected limb something to do, like squeezing a stress ball. Since the first case of AHS was identified in 1909, fewer than 50 others have been recorded. With further study, doctors may be able to learn more about the condition.
Are you or someone you know affected by alien hand syndrome? This condition can be very inconvenient, but thankfully, patients often learn strategies to limit the effect on their lives. Most learn they have little to fear from their alien limbs!
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