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The Secondary Somatosensory Cortex Gates Mechanical and Thermal Sensitivity.

Daniel G TaubQiufen JiangFrancesca PietrafesaJunfeng SuCaitlin GreeneMichael R BlanchardAakanksha JainMahmoud El-RifaiAlexis CallenKatherine YagerClara ChungZhigang HeChinfei ChenClifford J Woolf
Published in: bioRxiv : the preprint server for biology (2023)
The cerebral cortex is vital for the perception and processing of sensory stimuli. In the somatosensory axis, information is received by two distinct regions, the primary (S1) and secondary (S2) somatosensory cortices. Top-down circuits stemming from S1 can modulate mechanical and cooling but not heat stimuli such that circuit inhibition causes blunted mechanical and cooling perception. Using optogenetics and chemogenetics, we find that in contrast to S1, an inhibition of S2 output increases mechanical and heat, but not cooling sensitivity. Combining 2-photon anatomical reconstruction with chemogenetic inhibition of specific S2 circuits, we discover that S2 projections to the secondary motor cortex (M2) govern mechanical and thermal sensitivity without affecting motor or cognitive function. This suggests that while S2, like S1, encodes specific sensory information, that S2 operates through quite distinct neural substrates to modulate responsiveness to particular somatosensory stimuli and that somatosensory cortical encoding occurs in a largely parallel fashion.
Keyphrases
  • transcranial direct current stimulation
  • functional connectivity
  • healthcare
  • heat stress
  • magnetic resonance imaging
  • working memory