Active_comparator: Arm 1: Assessments and questionnaires only

Complete questionnaires on RLS and pain~Stimulation:~H-reflex - A small electrical stimulus is provided to the leg and foot area and a measurement of the stimulus is taken by the EEG electrodes.~Somatosensory evoked potential (SSEP) - A small electrical stimulus is provided to a nerve on the body and measured at several places along the nervous system (spinal cord, brain, etc.) with the EMG and EEG electrodes.~Vibratory Electrophysiological Response Potential (ERP) - stimulation of the ankle with vibration sensations using a device like a buzzer and recording of body's responses using the EEG and/or EMG electrodes.~Transcranial Magnetic Stimulation (TMS) - A small magnetic pulse is used to provide a small amount of electrical stimulation to nervous system. The EEG and/or EMG electrodes will be used to measure body's reaction.

Active_comparator: Arm 2: Off-on-off

Participants will turn OFF their SCS at least 48 hours prior to the visit. The assessments listed in Arm 1 will be performed and the SCS will be turned ON for at least 60 minutes before repeating the assessments. Participants may repeat the questionnaires during this waiting period.~Finally, the SCS is turned OFF again, this time for at least 30 minutes before repeating the assessments, except for the h-reflex, which will not be needed again. As with before, participants can complete the questionnaires during this waiting period.

Active_comparator: Arm 3: Off-on-off post-op

Participants will perform the same procedures as those in Arm 2, but only after 2-3 weeks from receiving a permanent SCS.

Active_comparator: Arm 4: On-off-on

Participants will have their SCS on for at least 48 hours prior to the visit. The assessments listed in Arm 1 will be performed and the SCS will be turned Off for at least 60 minutes before repeating the assessments. Participants may repeat the questionnaires during this waiting period.~Finally, the SCS is turned On again, this time for at least 30 minutes before repeating the assessments, except for the h-reflex, which will not be needed again. As with before, participants can complete the questionnaires during this waiting period.