World Society for Stereotactic and Functional Neurosurgery / European Society for Stereotactic and Functional Neurosurgery 8th Meeting of the World Society for Stereotactic and Functional Neurosurgery/ 5th Meeting of the European Society for Stereotactic and Functional Neurosurgery, Zürich, July 1981: Part I: Neural Prosthesis and Neurostimulation. Special Topic Issue: Stereotactic and Functional Neurosurgery 1982, Vol