1. Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
2. The Picower Institute for Learning and Memory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
3. Department of Electrical Engineering and Computer Science, University of Liège, 4000 Liège, Belgium
4. Solomon Snyder Department of Neuroscience, Johns Hopkins University, Baltimore, MD 21218, USA
5. School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA