1. Research Laboratory of Electronics and McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
3. Department of Biology, Wellesley College, Wellesley, MA 02481, USA.
4. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02139, USA.
5. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
6. Department of Health Sciences and Technology at the Swiss Federal Institute of Technology in Zürich (ETHZ), Zürich 8093, Switzerland.
7. Division of Neurotherapeutics, Massachusetts General Hospital and Department of Psychiatry, Harvard Medical School, Charlestown, MA 02129, USA.
8. Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.