In recent years, motor imagery (MI) and action observation (AO) therapy strategies have been used in rehabilitation programs to increase motor learning in Parkinson's disease (PD). Visuomotor training strategies such as AO and MI therapy rely on the activity of the mirror neuron system to facilitate motor re-learning. Mirror neurons are activated during the performance of goal-directed actions, also when observing the same action and visualizing the action in the mind. The aim of this clinical trial is to test whether the application of AO and MI treatment in PD in addition to conventional rehabilitation programs has an additional effect on Balance, Functional Status and Quality of Life.