tDCS for word finding, speech, and walking in Parkinson's disease

You may qualify if

• Diagnosed with PD having a verbal fluency deficit based on neuropsychological test (T-score < 40 or a T-score <-1.0 SD below the average T-score): Semantic Object Retrieval Test (SORT), COWAT (both letter and category fluency), Boston Naming Test (BNT), Rey Auditory Verbal Learning Test (RAVLT)
• 50 - 90 years old
• Capable of understanding and signing an informed consent (able to answer consent comprehension questions)
• Fluent in speaking and reading English

You can't join if

• A potentially study-confounding, tDCS-contraindicated, or EEG-contraindicated psychological, neuropsychiatric, neurological, or other medical issues:; Montreal Cognitve Assessment (MOCA) score <23, unless an accompanying study partner/caregiver is with them and we can obtain the written consent of both the participant and the participant's accompanying study partner/caregiver (i.e., the participant's spouse, adult child, parent, or adult sibling);; history of seizures;; unexplained episodes of loss of consciousness (as these may be related to brain alterations or epilepsy);; suffering from severe or frequent headaches;; unstable or uncontrolled neuropsychiatric illness;; severe traumatic brain injury (based on the Ohio State TBI Identification; Method);; brain tumor; stroke; present drug abuse/misuse;; brain tumor;; serious or life-threatening diseases, including congestive heart failure, chronic obstructive pulmonary disease, or active malignancy;; Huntington's disease;; stroke;; cranial implants or skull defects that affect tDCS administration;; implanted brain medical devices, including, deep brain stimulators (DBS);; implanted pacemakers;; any electrically, magnetically, or mechanically activated implants;; cardiac, neural, or medication implants;; vascular clips or other electrically sensitive support systems in the brain;; damaged skin at the sites of stimulation (the device should only be used on healthy, intact skin, as wounds may alter resistance to current);; skin conditions such as dermatitis, psoriasis, or eczema;; pregnant women;; diagnosis of just dysarthria; Use of medications that interact with or potentially interact with tDCS or EEG effects:; anti-convulsants;; carbamazepine;; sulpiride;; pergolide;; lorazepam;; rivastigmine;; dextromethorphan;; D-cycloserine;; flunarizine;; ropinirole;; citalopram;; stimulants; Additionally, non-English speakers will be excluded because not all of the screening forms, questionnaires, and tests are available in languages other than English.