 The current study aim to establish the therapeutic potential of tDCS for freezing of gait FOG and motor-cognitive dysfunctions in Parkinsons Disease PD. FOG phenomenon is often unresponsive to pharmacological and other treatments, especially in the advanced stages of the disease. While it is likely that Transcranial direct current stimulation tDCS will provide symptomatic relief, we will also explore, via secondary outcomes, the potential for tDCS to modify disease progression. Support for this possibility stems from the likely mechanisms of action of tDCS. 