 Participants: A total of 85 patients will be recruited Hoehn and Yahr Stage 1-3.5 who suffer from FOG, as measured by the new FOG questionnaire NFOG-Q and as demonstrated in response to a FOG provoking protocol, who are on stable medications, who have no contraindications to tDCS, and who are between the ages of 40-80. Patients with DBS will not be included. 