Michiel Spapé, Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland Keith M. Davis III, Department of Computer Science, University of Helsinki, Helsinki, Finland Lauri Kangassalo, Department of Computer Science, University of Helsinki, Helsinki, Finland Niklas Ravaja, Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland Zania Sovijärvi-Spapé, Department of Computer Science, University of Helsinki, Helsinki, Finland Tuukka Ruotsalo, Department of Computer Science, University of Helsinki, Helsinki, Finland