1. Center for the Neural Basis of Cognition, Pittsburgh, Pennsylvania
2. Center for Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania
3. Center for Neural Science, New York University, New York, New York
4. Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania
5. Carnegie Mellon Neuroscience Institute, Pittsburgh, Pennsylvania
6. Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania