Christopher Jarzynski^*

• Theoretical Division, T-13, MS B213, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Daniel K. Wójcik^†

• Center for Nonlinear Science, School of Physics, Georgia Institute of Technology, 837 State Street, Atlanta, Georgia 30332-0430, USA and Department of Neurophysiology, Nencki Institute of Experimental Biology, 3 Pasteur Street, 02-093 Warsaw, Poland

• ^*Electronic address: chrisj@lanl.gov
• ^†Electronic address: danek@cns.physics.gatech.edu