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Robotic Stroking on the Face and Forearm: Touch Satiety and Effects on Mechanical Pain
Section of Oral and Maxillofacial Surgery, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark; Scandinavian Center for Orofacial Neurosciences, Aarhus, Denmark.
Scandinavian Center for Orofacial Neurosciences, Aarhus, Denmark; Section of Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.
Linköping University, Department of Biomedical and Clinical Sciences, Center for Social and Affective Neuroscience. Linköping University, Faculty of Medicine and Health Sciences.
Scandinavian Center for Orofacial Neurosciences, Aarhus, Denmark; Section of Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark; Department of Orofacial Pain and Jaw Function, Faculty of Odontology, Malmo University, Malmo, Sweden.
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2021 (English)In: Frontiers in pain research, ISSN 2673-561X, Vol. 2, article id 693987Article in journal (Refereed) Published
Abstract [en]

Background: Slow stroking touch is generally perceived as pleasant and reduces thermal pain. However, the tactile stimuli applied tend to be short-lasting and typically applied to the forearm. This study aimed to compare the effects of a long-lasting brushing stimulus applied to the facial region and the forearm on pressure pain thresholds (PPTs) taken on the hand. Outcome measurements were touch satiety and concurrent mechanical pain thresholds of the hand. Methods: A total of 24 participants were recruited and randomized to receive continuous stroking, utilizing a robotic stimulator, at C-tactile (CT) favorable (3 cm/s) and non-favorable (30 cm/s) velocities applied to the right face or forearm. Ratings of touch pleasantness and unpleasantness and PPTs from the hypothenar muscle of the right hand were collected at the start of stroking and once per minute for 5 min. Results: A reduction in PPTs (increased pain sensitivity) was observed over time (P < 0.001). However, the increase in pain sensitivity was less prominent when the face was stroked compared to the forearm (P = 0.001). Continuous stroking resulted in a significant interaction between region and time (P = 0.008) on pleasantness ratings, with a decline in ratings observed over time for the forearm, but not on the face. Unpleasantness ratings were generally low. Conclusion: We observed touch satiety for 5 min of continuous robotic brushing on the forearm confirming previous studies. However, we did not observe any touch satiety for brushing the face. Mechanical pain sensitivity, measured in the hand, increased over the 5-min period but less so when paired with brushing on the face than with brushing on the forearm. The differential effects of brushing on the face and forearm on touch satiety and pain modulation may be by the differences in the emotional relevance and neuronal pathways involved.

Place, publisher, year, edition, pages
Lausanne, Switzerland: Frontiers Media S.A., 2021. Vol. 2, article id 693987
Keywords [en]
C-tactile afferent; orofacial pain; pleasantness; satiety; unpleasantness
National Category
Neurosciences
Identifiers
URN: urn:nbn:se:liu:diva-185177DOI: 10.3389/fpain.2021.693987ISI: 001002791200001PubMedID: 35295499OAI: oai:DiVA.org:liu-185177DiVA, id: diva2:1659055
Note

Funding agencies: Danish Dental Association,Aarhus University Research Foundation, and Swedish Research Council. 

Available from: 2022-05-18 Created: 2022-05-18 Last updated: 2024-01-08

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Olausson, Håkan

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