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Reference frames for spinal proprioception: kinematics based or kinetics based?

G Bosco1, R E Poppele

  • 1Department of Neuroscience, University of Minnesota, Minneapolis 55455, USA.

Journal of Neurophysiology
|May 11, 2000
PubMed
Summary
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Muscle tension afferent information minimally impacts dorsal spinocerebellar tract (DSCT) neuronal representations of foot position. The preferred direction of DSCT neurons remains invariant, suggesting a kinematic reference frame for sensorimotor control.

Area of Science:

  • Neuroscience
  • Motor Control
  • Sensory Physiology

Background:

  • Sensorimotor representations in the central nervous system (CNS) involve the interplay of kinematic and kinetic information.
  • The dorsal spinocerebellar tract (DSCT) plays a crucial role in transmitting proprioceptive information for motor control.

Purpose of the Study:

  • To investigate the contribution of muscle tension afferent information to DSCT sensory representations of foot position.
  • To determine the relative weighting of kinematic versus kinetic cues in DSCT neuronal activity.

Main Methods:

  • Experiments were conducted on anesthetized cats, activating hindlimb muscle groups via electrical stimulation of ventral root filaments.
  • Passive positioning of the hind foot throughout its workspace while recording DSCT neuronal activity.

Related Experiment Videos

  • Multivariate regression analysis was employed to assess the effects of muscle stimulation on neuronal firing rates and spatial tuning.

    • Main Results:

    • Muscle stimulation did not significantly alter hindlimb geometry.
    • The response gain of 59% of DSCT neurons was unaffected by muscle activation, though firing levels often changed.
    • The preferred direction of spatial tuning for most DSCT neurons remained invariant despite muscle stimulation or altered response gain.

    Conclusions:

    • The invariance of preferred direction suggests that DSCT coding of foot position is primarily based on limb kinematics.
    • Muscle afferent information appears to have a limited role in defining the reference frame for DSCT sensorimotor representations.
    • These findings contribute to understanding how the CNS integrates sensory information for precise motor control.