1. Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, United States
2. Departments of Physiology and Psychiatry, University of California, San Francisco, San Francisco, United States
3. Kavli Institute for Fundamental Neuroscience, University of California, San Francisco, San Francisco, United States
4. Department of Neurobiology, Stanford University School of Medicine, Stanford, United States
5. Department of Neurological Surgery, University of California, San Francisco, San Francisco, United States
6. Department of Mathematics and Statistics, Boston University, Boston, United States