1. a Computational NeuroDynamics Laboratory, 373 Dunn, University of Memphis, Memphis, TN 38152, USA
2. b Jet Propulsion Laboratory, California Institute of Technology, Planetary Robotics Laboratory, MS 82-105, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
3. c Jet Propulsion Laboratory, California Institute of Technology, Planetary Robotics Laboratory, MS 82-105, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
4. d Applied Physics Laboratory, Johns Hopkins University, 11100 Johns Hopkins Road, Laurel, MD 20723, USA
5. e Computational NeuroDynamics Laboratory, 373 Dunn, University of Memphis, Memphis, TN 38152, USA
6. f Division of Neurobiology, MCB, University of California at Berkeley, 101 Donner, Berkeley, CA 94720, USA