Jump to ContentJump to Main Navigation
Show Summary Details
More options …

Scandinavian Journal of Pain

Official Journal of the Scandinavian Association for the Study of Pain

Editor-in-Chief: Breivik, Harald


CiteScore 2018: 0.85

SCImago Journal Rank (SJR) 2018: 0.494
Source Normalized Impact per Paper (SNIP) 2018: 0.427

Online
ISSN
1877-8879
See all formats and pricing
More options …
Volume 16, Issue 1

Issues

Tempo-spatial discrimination to non-noxious stimuli is better than for noxious stimuli

Ken Steffen Frahm
  • Integrative Neuroscience Group, Center for Neuroplasticity and Pain (CNAP), SMI®, Department of Health Science & Technology, Aalborg University, 9220, Aalborg, Denmark
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Carsten Dahl Mørch
  • Integrative Neuroscience Group, Center for Neuroplasticity and Pain (CNAP), SMI®, Department of Health Science & Technology, Aalborg University, 9220, Aalborg, Denmark
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ole Kæseler Andersen
  • Integrative Neuroscience Group, Center for Neuroplasticity and Pain (CNAP), SMI®, Department of Health Science & Technology, Aalborg University, 9220, Aalborg, Denmark
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-07-01 | DOI: https://doi.org/10.1016/j.sjpain.2017.04.021

Abstract

Aims

The exteroceptive sensory system is responsible for sensing external stimuli in relation to time and space. The aim of the study was to investigate the tempo-spatial properties of the exteroceptive system using laser heat and mechanical touch stimulation.

Methods

13 healthy subjects were stimulated in the volar forearm. Each subject was stimulated using two paradigms, a continuous stimulation along a continuous line on the skin, and a simultaneous 2-point stimulation. The line stimulations were delivered in both a distal and proximal direction with lengths of 25, 50, 75, and 100 mm. The 2-point stimulations were delivered with a point-to-point distance ranging from 10 to 100 mm, in steps of 10 mm. Both paradigms were delivered using painful heat (laser) stimulation and mechanical (touch) stimulation. Following each stimulation, subjects had to report the intensity (0–10 NRS, 3 being pain threshold) and either direction (line stimuli) or number of perceived points (2-point stimuli).

Results

All four line lengths and both directions were reported correctly for all mechanical line stimulation (an accuracy of 100%). For laser line stimulation the directional discrimination threshold was 68.5 mm and 70.2 mm for distal and proximal directed stimuli, respectively. The 2-point discrimination threshold for heat stimulation (67.9 mm) was higher than for the mechanical stimulation (34.5 mm). NRS was significant higher for laser stimulations than for the mechanical stimulation for both line and 2-point stimulations. NRS increased both with line length and distance between the two points (ANOVA, p < 0.001). The average NRS was 3.15 and 0.91 for laser line and mechanical line stimulations, respectively. For 2-point stimulation the average NRS was 3.72 and 1.06 for laser and mechanical stimulations, respectively.

Conclusions

The findings indicate that the tempo-spatial acuity of the exteroceptive system is lower for noxious stimuli than for innoxious stimuli. This is possible due to the larger receptive fields of nociceptive neurons and/or less lateral inhibition.

About the article

Published Online: 2017-07-01

Published in Print: 2017-07-01


Citation Information: Scandinavian Journal of Pain, Volume 16, Issue 1, Pages 171–171, ISSN (Online) 1877-8879, ISSN (Print) 1877-8860, DOI: https://doi.org/10.1016/j.sjpain.2017.04.021.

Export Citation

© 2017 Scandinavian Association for the Study of Pain.Get Permission

Comments (0)

Please log in or register to comment.
Log in