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Pleasant touch: Behavioural and hemodynamic responses to a protocol for systematic assessment of tactile stimulation

Authors: Abagnale, Simona; Panico, Francesco; Sagliano, Laura; Gosseries, Olivia; Trojano, Luigi;

Pleasant touch: Behavioural and hemodynamic responses to a protocol for systematic assessment of tactile stimulation

Abstract

Pleasant touch is a form of tactile stimulation mediated by tactile C afferent fibres. It involves the encoding of the emotional value associated with tactile stimulation and subserves important social functions. Although pleasant touch has gathered increased interest in recent years, no protocol has been proposed to assess it with a robust and reliable method. In the present study we adopted a rigorous protocol for evaluating the pleasantness or unpleasantness of 9 tactile (pleasant, unpleasant, or neutral) stimuli delivered on eight body areas in healthy individuals. We recorded participants' ratings on pleasantness and intensity of the stimulus, as well as their activity in the prefrontal cortex (PFC) by functional near-infrared spectroscopy (fNIRS). A questionnaire evaluated participants' subjective experience of touch in everyday life. The behavioural results confirmed the effectiveness of the protocol as the stimuli selected to evoke pleasantness were perceived as significantly more pleasant than unpleasant and neutral ones, whereas unpleasant stimuli were perceived as more intense than all other stimuli. The participants reported the palm of the hand, particularly the left one, as the most sensitive area to tactile stimulation. Judgements of pleasantness were positively correlated with subjective experience of touch in everyday life. fNIRS data showed increased activity in the prefrontal cortex particularly during stimulation with pleasant and unpleasant stimuli, consistent with behavioural findings. Overall, this study contributes to understand the processing of pleasant touch and its neural correlates, while introducing a rigorous protocol for investigating tactile stimulation. This protocol holds promise for future utilisation in both healthy and clinical populations.

Keywords

Male, Adult, Pleasure, Sciences sociales & comportementales, psychologie, Spectroscopy, Near-Infrared/methods, Cognitive Neuroscience, Emotions, Somatosensory, Prefrontal Cortex, fNIRS, Experimental and Cognitive Psychology, Hemodynamics/physiology, Prefrontal cortex, Young Adult, Pleasure/physiology, Physical Stimulation, Humans, Touch Perception/physiology, Neurosciences & comportement, Tactile stimulation, Spectroscopy, Near-Infrared, Pleasant touch, Neurosciences & behavior, Hemodynamics, Touch/physiology, Neuropsychology and Physiological Psychology, Physical Stimulation/methods, Touch Perception, Pleasant touch; Prefrontal cortex; Somatosensory; Tactile stimulation; fNIRS, Prefrontal Cortex/physiology, Touch, Emotions/physiology, Social & behavioral sciences, psychology, Female

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
Top 10%
Average
Average
hybrid
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