Spinal Cord Stimulation Modulates Rat Cortico-Basal Ganglia Locomotor Circuit.

Area of Science:

• Neuroscience
• Motor Control
• Neuromodulation

Background:

• The cortico-basal ganglia circuit is vital for locomotion and movement disorders.
• Spinal cord stimulation (SCS) modulates this circuit, offering potential for motor function restoration.
• Effects of SCS on healthy motor circuits during gait initiation remain unclear.

Purpose of the Study:

• To evaluate dynamic spectral features of motor networks during locomotor initiation with SCS.
• To understand SCS effects on pre- and postgait brain activity.

Main Methods:

• Wistar rats received SCS (30-150 μA, 100-500 Hz).
• Electrophysiological recordings were taken from motor and sensory cortices, and basal ganglia nuclei.
• Video tracking analyzed treadmill locomotion, motor planning, and gait initiation.

Main Results:

• Without SCS, gait initiation showed increased low-frequency activity, with post-initiation showing increased alpha/beta and decreased delta rhythms.
• SCS reduced alpha and beta rhythms in motor areas during movement initiation.
• SCS affected delta and alpha rhythms in the sensorimotor area during movement planning.

Conclusions:

• SCS demonstrated short-term effects on motor circuit brain areas, potentially facilitating movement planning and initiation.
• Electrophysiological data may aid understanding of basal ganglia networks.
• Findings could inform new treatments for gait initiation disorders.