1. Department of Psychology, City, University of London, London EC1V 0HB, UK
2. School of Psychological Science, University of Bristol, Bristol BS8 1TU, UK
3. Department of Computer Science, Universitat de Lleida, Carrer de Jaume II, 67, 25001 Lleida, Spain
4. International Center for Mathematical Modeling in Physics and Cognitive Science, Linnaeus University, Universitetplatsen 1, 351 95 Växjö, Sweden