Exploring social touch in autistic and non-autistic adults via a self-report body-painting task: The role of sex, social context and body area
Authors: Mello Manuel , Fusaro Martina , Aglioti Salvatore Maria , Minio-Paluello Ilaria 
Published: January 2024

In the typically developing population, social touch experiences are influenced by several factors, including the biological sex of toucher and receiver, the body area wherein the touch is delivered and the social context in which the tactile exchange occurs. However, it is currently unexplored how social touch experiences of autistic adults are modulated by these factors. We sought to address this by utilizing a self-report body-painting task. Our main results show that autistic, compared with non-autistic, adults reported lower levels of pleasantness, erogeneity and appropriateness, specifically in intimate and friendly social contexts and in body areas typically touched in these situations. Importantly, sex played a major role in group differences. For instance, although autistic females reported, across social contexts, less pleasantness than both non-autistic females and autistic males, they experienced similar levels of appropriateness in the professional social context, usually deemed as touch-appropriate. Our findings provide new support to the hypothesis that social touch is experienced and possibly conceptualized differently by autistic compared with non-autistic adults. Moreover, by identifying the factors that influence social touch processing in autistic adults, our results might aid the development of support for autistic individuals seeking help in the spheres of social and intimate touch. Lay Abstract What is already known about the topic? At least in neurotypical individuals, social touch represents an important channel for emotional communication associated with social bonding and pain/anxiety modulation. Autistic adults report to avoid social touch more and to have different tactile sensitivity than their non-autistic comparisons. What this paper adds? Few studies specifically investigated social touch in autistic individuals, and none of them examined the role of participants’ sex, social context in which social touch occurs, and specific body areas being touched. In our study, adult participants reported how pleasant, erogenous and appropriate they would consider touches delivered by another person over their entire body in intimate (date), friendly (dance class) and professional (physiotherapy-massage session) social contexts. Autistic adults reported social touch to be less pleasant, erogenous and appropriate specifically in intimate and friendly social contexts and in body areas typically touched in these situations. Importantly, autistic females seem more at risk to experience unpleasant social touch as, although they considered it more unpleasant than non-autistic females and autistic males, they did consider it similarly appropriate in professional social contexts where touch is normed to be socially appropriate. Implications for practice, research or policy Our results might improve awareness and understanding about autistic adults’ different, and often more discomforting, experience of social touch and thus help consider and respect it during everyday social interactions. Our results might also benefit future research investigating, for instance, the neural underpinnings of social touch differences in autism or aiming at developing support for autistic individuals seeking help in the diverse spheres of social touch.