Deep brain stimulation of the subthalamic nucleus in those with Parkinson's disease has identified the zona incerta as a promising target area for effective therapy. Unlike deep bilateral stimulation of the ventral lateral nucleus such stimulation of the zona incerta improves all aspects of tremor including both the distal and proximal parts of limbs and the body more generally. This also occurs without dysarthria and disequilibrium as this stimulation does not interrupt proprioceptive sensation and the processing of the fine motor skill movements of vocal cords.