Disentangling the spinal mechanisms of illusory heat and burning sensations in the thermal grill illusion

Alexandra G. Mitchell*, Jesper Fischer Ehmsen, Daniel Elmstrøm Christensen, Anna Villaume Stuckert, Patrick Haggard, Francesca Fardo

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

2 Citations (Scopus)

Abstract

The thermal grill illusion (TGI), a phenomenon in which the juxtaposition of innocuous warm and cold temperatures on the skin elicits a burning sensation, offers a unique perspective to how pain occurs in response to harmless stimuli. We investigated the role of the spinal cord in the generation of the TGI across 2 experiments (total n 5 80). We applied heat and cold stimuli to dermatomes, areas of skin innervated by a single spinal nerve, that mapped onto adjacent or nonadjacent spinal segments. Enhanced warm and burning ratings during the TGI were observed when cold and warm stimuli were confined within the same dermatome. Furthermore, we found the spatial organisation of warm and cold stimuli within and across dermatomes affected TGI perception. Perceived warmth and burning intensity increased when the cold stimulus projected to the segment more caudal to the warm stimulus, whereas perceived cold during the TGI decreased compared with the opposite spatial arrangement. This suggests that the perception of TGI is enhanced when cold afferents are projected to spinal segments positioned caudally in relation to those receiving warm afferents. Our results indicate distinct interaction of sensory pathways based on the segmental arrangement of afferent fibres and are consistent with current interpretations of the spread and integration of thermosensory information along the spinal cord.

Original languageEnglish
JournalPain
Volume165
Issue10
Pages (from-to)2370-2378
Number of pages9
ISSN0304-3959
DOIs
Publication statusPublished - 1 Oct 2024

Keywords

  • Pain
  • Spinal cord
  • Thermal grill illusion
  • Thermosensation

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