Related Experiment Videos
Spatial summation in human thermal pain perception: comparison within and between dermatomes
D K Douglass1, E Carstens, L R Watkins
1Department of Animal Physiology, University of California at Davis, Dans, CA 95616 USA Department of Psychology, University of Colorado at Boulder, Boulder, CO 80309 USA.
Pain
|August 1, 1992
Summary
Spatial summation significantly impacts human thermal pain perception. Whether stimuli are within or between dermatomes, the area of stimulation influences pain intensity and unpleasantness ratings.
Area of Science:
- Neuroscience
- Pain Perception
- Somatosensation
Background:
- Spatial summation of thermal pain is recognized within single dermatomes.
- Previous research has not fully explored summation across adjacent dermatomes.
Purpose of the Study:
- To investigate if spatial summation of thermal pain differs when stimuli are applied within versus between adjacent dermatomes.
- To quantify the role of stimulus area in thermal pain perception.
Main Methods:
- Noxious contact heat stimuli (43-51°C, 5s) were applied to the forearm at varying areas (0.21-2.10 cm²).
- Stimuli were presented either within a single dermatome or simultaneously across two adjacent dermatomes.
- Pain intensity and unpleasantness were rated using visual analog scales.
Main Results:
- Increasing stimulus area significantly increased pain intensity and unpleasantness ratings for temperatures between 45-51°C.
- No significant difference in pain ratings was observed when stimuli were applied across adjacent dermatomes compared to within a single dermatome for the same stimulus area.
Conclusions:
- Spatial summation of thermal pain occurs both within and between dermatomes.
- This summation effect is significant across a wide range of thermal pain, from threshold to tolerance.