- Participant is unable to understand the study requirements and the treatment procedures, or unwilling / unable to provide written informed consent before any study-specific tests or procedures are performed
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Participant is unwilling or unable to comply with visit schedule and study related procedures
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Participant's medication regimen has not been stable for at least 28 days prior to CG initiation
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Participant's DBS stimulation settings have not been stable for at least 28 days prior to CG initiation
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Participant is less than 21 years of age or older than 75 years of age
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Participant is a female who is breastfeeding or of child-bearing potential with a positive urine pregnancy test or not using adequate contraception as determined by the study investigator
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Participant has a terminal illness with life expectancy of \< 1 year.
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- Participant has history of recurrent or unprovoked seizures.
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- Participant currently diagnosed with drug or alcohol abuse, per DSM-5 criteria.
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- Participant is in a very advanced stage of Parkinson's disease defined as: (i) Stage 5 as classified by the Hoehn and Yahr scale on medication and DBS (non-ambulatory) or (ii) participant requires an assistive device to perform the TBC OFF-meds /ON-DBS at the time of enrollment.
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- Participant has a condition that makes walking difficult or could interfere with the study procedures or confound the evaluation of the study data, including musculoskeletal issues, peripheral neuropathies, hip/knee prostheses, or any visual or anatomical abnormality that affects their walking.
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- Participant has disabling dyskinesias.
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- Participant has a history of suicide attempt or current active suicidal ideation as determined by a positive response to Items 2-5 of suicide ideation sub-scale of the Columbia Suicide Severity Rating Scale (CSSRS).
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- Participant, at the time of enrollment, fails the subthalamic nucleus (STN) stimulation challenge test (subject must perceive distinct bilateral sensations).
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- Participant has less than 8% arrhythmicity as measured in the Turning and Barrier Course Figures of 8 (TBC-F8) pre-CG therapy (ON Medications/ON DBS /OFF CG).
Please contact study team for additional exclusion criteria
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