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Spinomuscular coherence in monkeys performing a precision grip task.

Tomohiko Takei1, Kazuhiko Seki

  • 1Department of Developmental Physiology, National Institute for Physiological Sciences, 38 Nishigounaka, Myodaiji, Okazaki, Aichi 444-8585, Japan.

Journal of Neurophysiology
|February 1, 2008
PubMed
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Spinal cord local field potentials (LFPs) show coherence with muscle activity during precision grip. Two types of coherence, narrowband and broadband, were identified, suggesting distinct roles in motor control and spinal physiology.

Area of Science:

  • Neuroscience
  • Motor Control
  • Spinal Cord Physiology

Background:

  • Motor control relies on precise coordination between the central nervous system and muscles.
  • Spinal cord plays a crucial role in processing motor commands and sensory feedback.
  • Understanding spinal cord activity during motor tasks is essential for deciphering motor control mechanisms.

Purpose of the Study:

  • To investigate the relationship between spinal cord activity and muscle activity during a precision grip task.
  • To characterize the nature and location of coherence between local field potentials (LFPs) and electromyographic (EMG) signals in the cervical spinal cord.

Main Methods:

  • Recorded LFPs from the C(5)-C(8) segments of the spinal cord in monkeys.
  • Recorded EMG from hand and arm muscles during a precision grip task.

Related Experiment Videos

  • Analyzed LFP-EMG coherence, classifying it into narrowband and broadband types based on frequency and location.

    • Main Results:

    • Significant LFP-EMG coherence was found in 21% of recorded pairs.
    • Narrowband coherence (14-55 Hz) was widespread in the gray matter.
    • Broadband coherence (10-95 Hz) was localized to the ventral spinal cord.

    Conclusions:

    • Narrowband coherence may reflect the passage of brain-generated oscillations through spinal interneurons, influencing motor output and sensorimotor integration.
    • Broadband coherence might represent a unique characteristic of spinal motoneuron-muscle interactions.
    • These findings highlight distinct oscillatory mechanisms within the spinal cord during motor control.