1. Center for Neuroscience University of California 1544 Newton Court Davis CA 95618 USA
2. Department of Neurobiology, Physiology, and Behavior University of California Davis CA USA
3. Institute for Ophthalmology and Center for Integrative Neuroscience University of Tuebingen D‐72076 Tuebingen Germany
4. Department of Neurobiology Stanford University School of Medicine Stanford CA USA