160. Motor Learning Stages in Post-Stroke Patients During Training in a Virtual Environment L. Piron (Venezia,Italy),F. Cenni (Venezia,Italy),E. Zanotti (Venezia,Italy),E. Semenzato (Venezia,Italy),A. Alberti (Venezia,Italy),V. Iaia (Venezia,Italy),M. Dam (Padova,Italy),and P. Tonin (Venezia,Italy