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Nonlinear Connectivity in the Human Stretch Reflex Assessed by Cross-Frequency Phase Coupling.

Yuan Yang1, Teodoro Solis-Escalante1, Jun Yao2

  • 1* Department of Biomechanical Engineering, Delft University of Technology, Delft 2628 CD, The Netherlands.

International Journal of Neural Systems
|July 22, 2016
PubMed
Summary
This summary is machine-generated.

This study reveals nonlinear connectivity in the human stretch reflex, showing stronger synchronization from perturbation to muscle than to the brain. The findings highlight the dominance of the spinal reflex loop in this process.

Keywords:
EEGEMGStretch reflexnonlinear connectivitysensorimotor systemtime delay

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Area of Science:

  • Neuroscience
  • Motor Control
  • Systems Biology

Background:

  • Neuronal communication relies on synchronized oscillatory activity.
  • Nonlinearity is present in the sensorimotor system, but its connectivity is under-explored.
  • Understanding nonlinear connectivity is crucial for deciphering complex neural processes.

Purpose of the Study:

  • To investigate nonlinear connectivity during the human stretch reflex using neuronal synchronization.
  • To estimate directional nonlinear connectivity and time delays between perturbation, brain, and muscle.
  • To differentiate contributions of spinal and transcortical pathways to the stretch reflex.

Main Methods:

  • Healthy participants performed wrist flexion with periodic mechanical perturbation.
  • A novel cross-frequency phase coupling metric was employed to assess nonlinear connectivity.
  • Source localization techniques were used to identify brain regions involved.

Main Results:

  • Nonlinear phase coupling was significantly stronger from perturbation to muscle compared to perturbation to brain.
  • A shorter time delay (33 ms) was observed from perturbation to muscle, aligning with spinal stretch reflex latency.
  • Nonlinear coupling from brain to muscle originated from the motor cortex but had a weak effect.

Conclusions:

  • The human stretch reflex exhibits nonlinear neuronal synchronization.
  • Nonlinear phase coupling is predominantly mediated by the spinal reflex loop.
  • Transcranial pathways contribute minimally to the nonlinear dynamics of the wrist stretch reflex.