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I believe you are referring Deep Brain Stimulation (DBS). In deep-brain stimulation, a wire is implanted within a walnut-size area known as the thalamus, which acts as a relay station for sensory information. The electrode is connected to a thin cable running down through the neck to a half-dollar-size pulse generator that is implanted just below the collarbone. The generator supplies a tiny electrical current that disables the overactive nerve cells and turns off the tremors.