Healthy Clinical Trial
Official title:
Trial Investigating the Characteristics of Knismesis - a Lever to Explore Allodynia in Neuropathic Pain
Also known as a "moving itch", knismesis is a mildly annoying sensation caused by a light movement on the skin, such as from a crawling insect. Its underlying mechanism rely on spatial summation, i.e. amplification of the signal due to summation of stimulated fields, like it is for dynamic allodynia in neuropathic pain. This physiological study aims at determining the physical factors of the cutaneous stimulation inducing knismesis as well as the effect of confounding factors. The main area of exploration will be the back, because of its size and the possibility to blind the participant. The information collected, along with animal data in surrogate models, would help to better understand neuropathic pain in the future.
This is a physiological proof-of-concept, also aiming to validate a functional exploration model in healthy volunteers. Each participant will undergo a battery if psychometric then psychophysics tests, presented sequentially. However, most of the main study tests (knismesis) will be admistered in a random order (crossover). The primary endpoint is to characterise, in the healthy human, the physical determinants of the cutaneous stimulation inducing knismesis: length of the pathway, speed, direction, intensity, continuity break of the contact, hairiness, body site, or distraction by other cutaneous stimuli. The secondary endpoint is to study the relationship between the individual sensitivity to spatial summation (knismesis) and other individual sensitivities or profiles. ;
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