Transcranial Direct/ Alternating Current Stimulation for Parkinson's Disease Treatment

To investigate the difference in the treatment efficacy between transcranial direct current stimulation and transcranial alternating current stimulation on Parkinson's disease, including the improvements in the motor, cognitive, and underlying neural mechanisms behind differences in efficacy by electroencephalography (EEG).

Inclusion Criteria:diagnosis of idiopathic PD according to the movement disorder society criteriaright-handedno clinically known hearing or vision impairmentno history of epilepsy, dementia, other brain disorders apart from PD, severe internal organs disease, age-related frailty, etc.Exclusion Criteria:parkinsonism due to drugs, Cerebrovascular disease, encephalitis, poisoning, traumatic brain injury, etc.Metal implants in the head (i.e., deep brain stimulator or aneurysm clips)severe somatic or psychiatric disorders that require medication or routinely monitoringparticipated in other interventional studies within the past 3 months