Subcortical short-term plasticity elicited by deep brain stimulation

Area of Science:

• Neuroscience
• Biomedical Engineering
• Neurology

Background:

• Deep brain stimulation (DBS) is a therapeutic intervention for movement disorders.
• Understanding the immediate effects of DBS on neural tissue is crucial for optimizing treatment.
• Local neuroplasticity following DBS pulses remains incompletely understood.

Purpose of the Study:

• To investigate short-term neuroplasticity induced by subthalamic, thalamic, and pallidal DBS.
• To characterize the electrophysiological responses to paired DBS pulses.
• To explore the relationship between these responses and therapeutic parameters.

Main Methods:

• Recorded local field potentials from implanted DBS electrode arrays in 17 participants.
• Delivered paired stimulus pulses at various interstimulus intervals.
• Analyzed signal latency, amplitude, and refractory periods using linear mixed effects models.

Main Results:

• DBS evoked short-latency local field potentials at all targets.
• Interstimulus interval significantly modulated evoked potential amplitude and latency.
• Paired pulse facilitation was observed in the subthalamic-pallidal circuit, correlating with beta power and therapeutic DBS parameters.

Conclusions:

• Paired DBS pulses induce short-term neuroplasticity and synchronize local circuit electrophysiology.
• These evoked potentials represent early interactions between DBS and neural tissue.
• Subcortical evoked potentials may serve as biomarkers for guiding next-generation DBS devices.