Participants will be asked to walk along with the metronome beats (RAS) during the participants' stimulation state (ON or OFF) for four minutes for each state. The researcher will collect the gait parameters (cadence, velocity, and stride length) of patients before, during, and after RAS in both DBS ON and OFF states. Using MDS-UPDRS, participants' gait patterns will be collected before and after RAS while both DBS is ON and OFF. Electrophysiological activity (local field potentials, LFPs) will be collected across all stages (pre, during, and post-RAS) of evaluation.
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Change in gait cadence (steps/minute)
Timeframe: 0 minute (Baseline 1, DBS ON), 5 minutes, 10 minutes, 20 minutes (Baseline 2, DBS OFF), 25 minutes, and 30 minutes
Change in gait velocity (meter/minute)
Timeframe: 0 minute (Baseline 1, DBS ON), 5 minutes, 10 minutes, 20 minutes (Baseline 2, DBS OFF), 25 minutes, and 30 minutes
Change in gait stride length (meter)
Timeframe: 0 minute (Baseline 1, DBS ON), 5 minutes, 10 minutes, 20 minutes (Baseline 2, DBS OFF), 25 minutes, and 30 minutes
Changes in MDS-UPDRS-III (section 3.9. Arising From Chair ) score
Timeframe: 0 minute (Baseline 1, DBS ON), 10 minutes, 20 minutes (Baseline 2, DBS OFF), 30 minutes
Change in MDS-UPDRS-III (section 3.10. Gait) score
Timeframe: 0 minute (Baseline 1, DBS ON), 10 minutes, 20 minutes (Baseline 2, DBS OFF), 30 minutes
Change in MDS-UPDRS-III (section 3.11. Freezing of gait) score
Timeframe: 0 minute (Baseline 1, DBS ON), 10 minutes, 20 minutes (Baseline 2, DBS OFF), 30 minutes
Change in MDS-UPDRS-III (section 3.12. Postural stability) score
Timeframe: 0 minute (Baseline 1, DBS ON), 10 minutes, 20 minutes (Baseline 2, DBS OFF), 30 minutes
Change in MDS-UPDRS-III (section 3.13. Posture) score
Timeframe: 0 minute (Baseline 1, DBS ON), 10 minutes, 20 minutes (Baseline 2, DBS OFF), 30 minutes