Repetitive Transcranial Magnetic Stimulation for Freezing of Gait

Inclusion Criteria: * Parkinson's disease or Primary progressive freezing of gait * age 18 and older * Freezing of gait Exclusion Criteria: * pregnant or any, other medical, surgical, neurological or psychiatric conditions * other restrictions which prevent you from undergoing TMS recording, such as; surgically or traumatically implanted foreign bodies such as a pacemaker, an implanted medication pump, a metal plate in the skull, or metal inside the skull or eyes (other than dental appliances or fillings), and/ or heart/cardiac lines * any past or current history of seizure disorder or epilepsy * unable to give informed consent