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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Sensorimotor integration during grasping is mediated by distinct M1 circuits.

Katia Botta1,2, Elisa Dolfini2, Andrea Casarotto1

  • 1IIT@UniFe Center for Translational Neurophysiology, Istituto Italiano di Tecnologia, Ferrara, Italy.

Journal of Neurophysiology
|September 22, 2025
PubMed
Summary

Short-latency afferent inhibition (SAI) differs during hand grasps. Transcranial magnetic stimulation (TMS) revealed distinct primary motor cortex (M1) circuit engagement for precision versus power grips, impacting sensorimotor integration.

Keywords:
current directionspower gripprecision gripsensorimotor integrationshort-latency afferent inhibition

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Area of Science:

  • Neuroscience
  • Motor Control
  • Somatosensory System

Background:

  • Motor control involves complex excitatory and inhibitory interactions.
  • Sensorimotor integration is crucial for hand movements.
  • Short-latency afferent inhibition (SAI) is a neurophysiological marker of sensorimotor integration.

Purpose of the Study:

  • To investigate SAI during different isometric hand grasping behaviors (precision vs. power grip).
  • To determine if distinct neuronal populations in the primary motor cortex (M1) are engaged by different transcranial magnetic stimulation (TMS) coil orientations.
  • To explore the relationship between grip type, TMS coil orientation, and sensorimotor integration markers.

Main Methods:

  • Applied TMS with antero-posterior (AP) and postero-anterior (PA) coil orientations to the primary motor cortex (M1).
  • Measured short-latency afferent inhibition (SAI) during precision and power grip tasks.
  • Assessed corticospinal excitability during different grip conditions and stimulation orientations.

Main Results:

  • Increased SAI was observed in the AP direction during grasp execution.
  • Precision grip showed enhanced corticospinal excitability with AP stimulation.
  • No significant grip-specific modulation of SAI was found, potentially due to thalamocortical afferent distribution and cholinergic modulation.

Conclusions:

  • Distinct cortical circuits within M1 are differentially engaged based on hand configuration and sensorimotor demands.
  • SAI modulation may not be strictly grip-specific, suggesting broader circuit recruitment or limitations in topographic precision.
  • Future research should examine SAI dynamics across different phases of prehension.