1. UNIDCOM/IADE – Research Center in Design and Communication of IADE, Institute of Visual Arts, Design and Marketing, Av. D. Carlos I, 4, 1200-649 Lisbon, Portugal.
2. CIPER/Ergonomics Laboratory, Technical University of Lisbon, Estrada da Costa, 1499-002 Cruz Quebrada, Dafundo, Portugal.
3. CIPER/Mathematics Unit, Technical University of Lisbon, Estrada da Costa, 1499-002 Cruz Quebrada, Dafundo, Portugal.
4. Department of Psychology, North Carolina State University, 640 Poe Hall, Campus Box 7650, Raleigh, NC, 27695-7650, USA.