Mirror, mirror: Scientists find cause of involuntary movements

Researchers have identified the genetic cause of mirror movements, where affected people are unable to move one side of the body without moving the other. For example, when trying to open and close their right hand, their left hand will unintentionally copy the movement. While mirror movements can be observed in fingers, hands, forearms, toes and feet of young children, persistence beyond the age of 10 is unusual.

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