1. Department of Cognitive Neurology; Hertie Institute for Clinical Brain Research; University of Tuebingen; Tuebingen Germany
2. Section for Computational Sensomotorics; Department of Cognitive Neurology; Hertie Institute for Clinical Brain Research and Center for Integrative Neuroscience; University Clinic Tuebingen; Tuebingen Germany
3. Istituto Italiano di Tecnologia; Center for Neuroscience and Cognitive Systems; Rovereto Italy
4. Harvard Medical School; Department of Neurobiology; Boston MA 02115 USA