1. Bartiméus, Institute for the Visually Impaired, Zeist, The Netherlands 2Behavioural Science Institute, Radboud University Nijmegen, Nijmegen, The Netherlands
2. Bartiméus, Institute for the Visually Impaired, Zeist, The Netherlands
3. Bartiméus, Institute for the Visually Impaired, Zeist, The Netherlands 4Department of Developmental Psychology, University of Groningen, The Netherlands
4. Free University Medical Centre, Amsterdam, The Netherlands
5. Behavioural Science Institute, Radboud University Nijmegen, Nijmegen, The Netherlands