J. S. Pezaris, M. Sahani, and R. A. Andersen, Tetrodes for Monkeys, CNS*95, Monterey, California, July 12-16, 1995. TETRODES FOR MONKEYS J. S. Pezaris, M. Sahani, R. A. Andersen Division of Biology Computation and Neural Systems California Institute of Technology, Pasadena, CA 91125, U.S.A. Abstract We have adapted the McNaughton-Wilson tetrode for use in monkey cortex. Eleven penetrations have been made over macaque area MT to evaluate the mechanical and electrical properties of our design. Experiments have been made with 15 and 25 micron insulated nichrome wire running through oil-filled 33 gauge stainless steel guide tubes. Electrically, the tetrodes compare favorably with traditional tungsten electrodes for single-unit isolation, and are superior for multi-unit recordings. Preliminary histology shows straight tracks at up to 12 mm tetrode extension. View Poster View Paper View Updated Paper John Pezaris, Caltech, Mail Code 216-76, Pasadena, CA 91125, john [at] pezaris [dot] com, 17 September 1995.