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Temporal dynamics of brain activation during 40 minutes of pleasant touch

Journal article
Authors Uta Sailer
Chantal Triscoli
Gisela Häggblad
Paul Hamilton
Håkan Olausson
Ilona Croy
Published in Neuroimage
Volume 139
Pages 360-367
ISSN 1053-8119
Publication year 2016
Published at Institute of Neuroscience and Physiology
Department of Education, Communication and Learning
Department of Psychology
Pages 360-367
Language en
Links dx.doi.org/10.1016/j.neuroimage.201...
Keywords Touch, Reward, Stroking, Inferior frontal gyrus, Putamen, Secondary somatosensory cortex, unmyelinated tactile afferents, human orbitofrontal cortex, human, parietal operculum, cytoarchitectonic areas, insular cortex, skin-stroking, hairy skin, responses, humans, reward, Neurosciences & Neurology, Radiology, Nuclear Medicine & Medical Imaging
Subject categories Neurology

Abstract

Introduction: Touch is important for individuals' subjective well-being, is typically rewarding, and is one of few sensory stimuli which are experienced as pleasant for a rather long time. This study tracked brain activation during slow stroking stimulation of the arm that was applied continuously for 40 min - a much longer time than what previous studies have investigated. Methods: 25 subjects were stroked for 40 min with a soft brush while they were scanned with functional Magnetic Resonance Imaging, and rated the perceived pleasantness of the brush stroking. Two resting baselines were included. Whole brain-based analyses investigated the neural response to long-lasting stroking. Results: Stroking was perceived as pleasant throughout scanning and activated areas that were previously found to be involved in the processing of pleasant touch. Activation in primary somatosensory cortex (S1) and S2, subdivision OP1, decreased over time, whereas activation in orbito-frontal gyrus (OFC) and putamen strongly increased until reaching a plateau after approximately 20 min. Similarly, functional connectivity of posterior insula with middle cingulate and striatal regions increased over time. Discussion: Long-lasting stroking was processed in similar areas as shorter-lasting stroking. The decreased activation in somatosensory cortices over time may represent stimulus habituation, whereas increased activation in OFC and putamen may relate to the stimulation's subjective reward value. This involvement of reward-related brain circuits can facilitate maintenance of long-lasting social touch interactions. (C) 2016 The Authors. Published by Elsevier Inc.

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