1. Faculty of Psychology, Vita-Salute San Raffaele University, Milan, Italy;
2. Laboratory of Movement Analysis, Vita-Salute San Raffaele University, Milan, Italy;
3. Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy; and
4. IUSS Center for Neurolinguistics and Theoretical Syntax Ne.T.S., Pavia, Italy;
5. Department of Nuclear Medicine, San Raffaele Scientific Institute, Milan, Italy