The off-line effect of affective touch on multisensory integration and tactile perceptual accuracy during the somatic signal detection task

Affective touch refers to the emotional and motivational facets of tactile sensation and has been linked to the activation of a specialised system of mechanosensory afferents (the CT system), that respond optimally to slow caress-like touch. Affective touch has been shown to play an important role i...

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Veröffentlicht in:PloS one 2021-12, Vol.16 (12), p.e0261060
Hauptverfasser: Sacchetti, Sofia, McGlone, Francis, Cazzato, Valentina, Mirams, Laura
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McGlone, Francis
Cazzato, Valentina
Mirams, Laura
description Affective touch refers to the emotional and motivational facets of tactile sensation and has been linked to the activation of a specialised system of mechanosensory afferents (the CT system), that respond optimally to slow caress-like touch. Affective touch has been shown to play an important role in the building of the bodily self: the multisensory integrated global awareness of one's own body. Here we investigated the effects of affective touch on subsequent tactile awareness and multisensory integration using the Somatic Signal Detection Task (SSDT). During the SSDT, participants were required to detect near-threshold tactile stimulation on their cheek, in the presence/absence of a concomitant light. Participants repeated the SSDT twice, before and after receiving a touch manipulation. Participants were divided into two groups: one received affective touch (CT optimal; n = 32), and the second received non-affective touch (non-CT optimal; n = 34). Levels of arousal (skin conductance levels, SCLs) and mood changes after the touch manipulation were also measured. Affective touch led to an increase in tactile accuracy, as indicated by less false reports of touch and a trend towards higher tactile sensitivity during the subsequent SSDT. Conversely, non-affective touch was found to induce a partial decrease in the correct detection of touch possibly due to a desensitization of skin mechanoreceptors. Both affective and non-affective touch induced a more positive mood and higher SCLs in participants. The increase in SCLs was greater after affective touch. We conclude that receiving affective touch enhances the sense of bodily self therefore increasing perceptual accuracy and awareness. Higher SCLs are suggested to be a possible mediator linking affective touch to a greater tactile accuracy. Clinical implications are discussed.
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Affective touch led to an increase in tactile accuracy, as indicated by less false reports of touch and a trend towards higher tactile sensitivity during the subsequent SSDT. Conversely, non-affective touch was found to induce a partial decrease in the correct detection of touch possibly due to a desensitization of skin mechanoreceptors. Both affective and non-affective touch induced a more positive mood and higher SCLs in participants. The increase in SCLs was greater after affective touch. We conclude that receiving affective touch enhances the sense of bodily self therefore increasing perceptual accuracy and awareness. Higher SCLs are suggested to be a possible mediator linking affective touch to a greater tactile accuracy. Clinical implications are discussed.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>34972120</pmid><doi>10.1371/journal.pone.0261060</doi><tpages>e0261060</tpages><orcidid>https://orcid.org/0000-0002-8130-983X</orcidid><orcidid>https://orcid.org/0000-0001-9826-7798</orcidid><oa>free_for_read</oa></addata></record>
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subjects Accuracy
Adult
Affect - physiology
Afferent Pathways - physiology
Arousal
Authorship
Biology and Life Sciences
Cheek
Desensitization
Female
Galvanic Skin Response
Humans
Hypotheses
Interpersonal relations
Mechanoreceptors
Medicine and Health Sciences
Middle Aged
Mood
Optimization
Physical Sciences
Physiological aspects
Receiving
Self Report
Sensory integration
Signal detection
Skin
Skin Physiological Phenomena
Social Sciences
Surveys and Questionnaires
Tactile stimuli
Task Performance and Analysis
Touch
Touch - physiology
Touch Perception - physiology
Velocity
Young Adult
title The off-line effect of affective touch on multisensory integration and tactile perceptual accuracy during the somatic signal detection task
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