Article (Scientific journals)
Dynamics of the perception and EEG signals triggered by tonic warm and cool stimulation.
Mulders, Dounia; de Bodt, Cyril; Lejeune, Nicolas et al.
2020In PLoS ONE, 15 (4), p. 0231698
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Keywords :
Adult; Alpha Rhythm/physiology; Analysis of Variance; Female; Habituation, Psychophysiologic; Humans; Male; Thermosensing/physiology; Time Factors; Young Adult; Cold Temperature; Electroencephalography; Hot Temperature; Perception; Signal Processing, Computer-Assisted; Alpha Rhythm; Thermosensing; Biochemistry, Genetics and Molecular Biology (all); Agricultural and Biological Sciences (all); Multidisciplinary
Abstract :
[en] Thermosensation is crucial for humans to probe the environment and detect threats arising from noxious heat or cold. Over the last years, EEG frequency-tagging using long-lasting periodic radiant heat stimulation has been proposed as a means to study the cortical processes underlying tonic heat perception. This approach is based on the notion that periodic modulation of a sustained stimulus can elicit synchronized periodic activity in the neuronal populations responding to the stimulus, known as a steady-state response (SSR). In this paper, we extend this approach using a contact thermode to generate both heat- and cold-evoked SSRs. Furthermore, we characterize the temporal dynamics of the elicited responses, relate these dynamics to perception, and assess the effects of displacing the stimulated skin surface to gain insight on the heat- and cold-sensitive afferents conveying these responses. Two experiments were conducted in healthy volunteers. In both experiments, noxious heat and innocuous cool stimuli were applied during 75 seconds to the forearm using a Peltier-based contact thermode, with intensities varying sinusoidally at 0.2 Hz. Displacement of the thermal stimulation on the skin surface was achieved by independently controlling the Peltier elements of the thermal probe. Continuous intensity ratings to sustained heat and cold stimulation were obtained in the first experiment with 14 subjects, and the EEG was recorded in the second experiment on 15 subjects. Both contact heat and cool stimulation elicited periodic EEG responses and percepts. Compared to heat stimulation, the responses to cool stimulation had a lower magnitude and shorter latency. All responses tended to habituate along time, and this response attenuation was most pronounced for cool compared to warm stimulation, and for stimulation delivered using a fixed surface compared to a variable surface.
Disciplines :
Neurology
Author, co-author :
Mulders, Dounia ;  ICTEAM institute, Université Catholique de Louvain, Louvain-la-Neuve, Belgium ; IONS institute, Université Catholique de Louvain, Brussels, Belgium
de Bodt, Cyril;  ICTEAM institute, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
Lejeune, Nicolas  ;  Université de Liège - ULiège > GIGA > GIGA Consciousness - Coma Science Group ; IONS institute, Université Catholique de Louvain, Brussels, Belgium
Courtin, Arthur ;  IONS institute, Université Catholique de Louvain, Brussels, Belgium
Liberati, Giulia ;  IONS institute, Université Catholique de Louvain, Brussels, Belgium
Verleysen, Michel;  ICTEAM institute, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
Mouraux, André;  IONS institute, Université Catholique de Louvain, Brussels, Belgium
Language :
English
Title :
Dynamics of the perception and EEG signals triggered by tonic warm and cool stimulation.
Publication date :
2020
Journal title :
PLoS ONE
eISSN :
1932-6203
Publisher :
Public Library of Science, United States
Volume :
15
Issue :
4
Pages :
e0231698
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
DM, CdB and NL are Research Fellows of the Fonds de la Recherche Scientique - FNRS (https://www.frs-fnrs.be/fr/). AC is supported by a FRIA doctoral grant from the FNRS. GL is a FNRS researcher. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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