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Frequency-dependent spike-pattern changes in motor cortex during thalamic deep brain stimulation.

Edward M Bello1, Filippo Agnesi1, Yizi Xiao1

  • 1Department of Biomedical Engineering, University of Minnesota, Minneapolis.

Journal of Neurophysiology
|September 23, 2020
PubMed
Summary
This summary is machine-generated.

Deep brain stimulation (DBS) of the motor thalamus alters motor cortex neuron activity. High frequencies regularize spike patterns, while low frequencies disorder them, revealing complex network effects.

Keywords:
DBSfrequencymechanismsmotor cortexthalamus

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Area of Science:

  • Neuroscience
  • Cellular Electrophysiology
  • Systems Neuroscience

Background:

  • Deep brain stimulation (DBS) targets the motor thalamus for essential tremor.
  • Cellular-level effects of thalamic DBS on the motor cortex remain unclear.
  • Stimulation frequency's impact on neuronal activity patterns is not fully understood.

Purpose of the Study:

  • Investigate cellular-level changes in the primary motor cortex (M1) during thalamic DBS.
  • Determine how M1 neuronal activity patterns depend on DBS frequency.
  • Clarify network mechanisms underlying thalamic DBS.

Main Methods:

  • Used a preclinical animal model for DBS.
  • Collected single-unit spike recordings in M1.
  • Analyzed M1 spike rates, entropy, and phase-locking across frequencies (10-130 Hz).

Main Results:

  • VPLo-DBS modulated individual M1 cell firing rates in a frequency-dependent manner.
  • Population spike rate showed weak frequency dependence.
  • High-frequency DBS decreased spike-pattern entropy via phase-locking and regularization.
  • Low-frequency DBS increased entropy (disordering), diminishing at higher frequencies.

Conclusions:

  • Spike-pattern entropy and phase-locking are distinct but important measures of stimulation effects.
  • Thalamic DBS induces complex, frequency-dependent changes in M1 neuronal activity.
  • Findings offer insights into cellular-level mechanisms of DBS for essential tremor.