1. Department of Physics, University of Cagliari, Complesso Universitario di Monserrato, Italy
2. Department of Pedagogy, Psychology, Philosophy, University of Cagliari, Italy
3. Center for Pervasive Developmental Disorders, Azienda Ospedaliera Brotzu, Cagliari, Italy
4. DUMAS—Department of Human and Social Sciences, University of Sassari, Italy
5. Department of Psychology, Hunter College, New York, NY, USA
6. IMT Institute for Advanced Studies, Lucca, Italy