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