Vagus nerve stimulator
Vagus nerve stimulator (right) implanted in a male patient's chest. This is a treatment for epilepsy. Stimulation of the vagus nerve with an electrical current reduces the number and severity of epileptic seizures. The stimulation is induced by holding a magnet (attached to a wristband) over the implant. The mechanism by which this stimulation affects seizures is not fully understood., Photo by SCIENCE PHOTO LIBRARY
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