<qa>  What is the Hamilton Depression Rating Scale?Please note that there is no inclusion or exclusion criteria based on depression or dementia. However, if these problems interfered with proficiency of data acquisition during the screening phase, they will not be eligible. The Hamilton Depression Rating Scale will be the measure used. Depression scale scores will be used as potential co-variants to compliance in exploratory analysis. Furthermore, treatment of other medical conditions will be allowed during the treatment period. Treatment of any feature of Parkinsons disease that does not involve the exclusionary medications see inclusionexclusion criteria will be allowed. 