1. Department of Cognitive Neuroscience, Biophysics Section Donders Institute for Brain, Cognition and Behaviour Radboud University Medical Centre Nijmegen Nijmegen The Netherlands
2. Department of Biophysics Donders Institute for Brain, Cognition and Behaviour Radboud University Nijmegen Nijmegen The Netherlands
3. Royal Dutch Visio National Foundation for the Visually Impaired and Blind Huizen The Netherlands
4. Bartiméus, Institute for the Visually Impaired Zeist The Netherlands