Inclusion Criteria:  Patient is able to walk independently The patient report on daily episodes of FOG as indicated by question #2 in the new FOG questionnaire ("How frequently do you experience freezing episodes?"). Score>18 on the Telephone Version of the Mini-Mental State Examination (TMMSE) Intact hearing and vision by self-declaration  Exclusion criteria  • The patient suffer of any neurological condition other than Parkinson's disease.