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Related Concept Videos

Somatosensation01:33

Somatosensation

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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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Beta resting-state functional connectivity predicts tactile spatial acuity.

Ryoki Sasaki1,2, Sho Kojima1,3, Naofumi Otsuru1,3

  • 1Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-Ku, Niigata City, Niigata 950-3198, Japan.

Cerebral Cortex (New York, N.Y. : 1991)
|June 21, 2023
PubMed
Summary

Specific beta corticocortical networks and local inhibitory networks in the primary somatosensory cortex (S1) predict tactile spatial acuity. Stronger S1 connectivity and weaker somatosensory gating correlate with better two-point discrimination performance.

Keywords:
functional connectivitymagnetoencephalographyprimary somatosensory cortexsomatosensory gatingtactile spatial acuity

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Sensory Processing

Background:

  • Tactile perception relies on the primary somatosensory cortex (S1) and its connections.
  • Somatosensory gating in S1 predicts tactile performance, but the role of corticocortical connections is unclear.

Purpose of the Study:

  • To investigate how corticocortical and local networks predict tactile spatial acuity.
  • To elucidate the functional relevance of brain connectivity in tactile perception.

Main Methods:

  • Magnetoencephalography (MEG) in 42 adults, recording resting-state and evoked responses.
  • Assessed S1-seed resting-state functional connectivity (rs-FC) and somatosensory gating using paired-pulse stimulation.
  • Measured two-point discrimination threshold with a custom device.

Main Results:

  • Beta rs-FC between S1 and parietal/temporal regions negatively correlated with discrimination threshold (better performance with stronger connectivity).
  • Somatosensory gating of N20m response negatively correlated with discrimination threshold (better performance with weaker gating).

Conclusions:

  • Specific beta corticocortical networks functionally support tactile spatial acuity.
  • Local inhibitory networks, indicated by somatosensory gating, also play a crucial role in tactile spatial resolution.