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Unmyelinated Tactile Cutaneous Nerves Signal Erotic Sensations

Artikel i vetenskaplig tidskrift
Författare Emma H. Jönsson
Helena Backlund Wasling
Vicktoria Wagnbeck
M. Dimitriadis
J. R. Georgiadis
Håkan Olausson
Ilona Croy
Publicerad i Journal of Sexual Medicine
Volym 12
Nummer/häfte 6
Sidor 1338-1345
ISSN 1743-6095
Publiceringsår 2015
Publicerad vid Institutionen för neurovetenskap och fysiologi
Sidor 1338-1345
Språk en
Länkar dx.doi.org/10.1111/jsm.12905
Ämnesord C Tactile, Touch, Erotic, Somatosensory, Pleasantness, Periphery, GLANS-PENIS, SEXUAL AROUSAL, TOUCH, AFFERENTS, Urology & Nephrology
Ämneskategorier Fysiologi, Idrottsvetenskap


IntroductionIntrapersonal touch is a powerful tool for communicating emotions and can among many things evoke feelings of eroticism and sexual arousal. The peripheral neural mechanisms of erotic touch signaling have been less studied. C tactile afferents (unmyelinated low-threshold mechanoreceptors), known to underpin pleasant aspects of touch processing, have been posited to play an important role. MethodIn two studies, we investigated the relationship between C tactile activation and the perception of erotic and pleasant touch, using tactile brushing stimulation. In total, 66 healthy subjects (37 women, age range 19-51 years) were examined. In study 1 (n=20), five different stroking velocities were applied to the forearm and the inner thigh. The participants answered questions about partnership, mood, and touch. In study 2 (n=46), the same five stroking velocities were applied to the forearm. The participants answered questions about partnership, touch, and sexuality. ResultsBoth touch eroticism and pleasantness were rated significantly higher for C tactile optimal velocities compared with suboptimal velocities. No difference was found between the ratings of the thigh and the forearm. The velocity-dependent rating curves of pleasantness, intensity, and eroticism differed from each other. Pleasantness was best explained by a quadratic fit, intensity by a linear fit, and eroticism by both. A linear transformation of pleasantness and intensity predicted the observed eroticism ratings reliably. Eroticism ratings were negatively correlated with length of relationship. ConclusionTouch was rated most erotic when perceived as pleasant and weak. In human hairy skin, perception of pleasantness is correlated with the firing rate of C tactile afferents, and perception of intensity is correlated with the firing rate of A afferents. Accordingly, eroticism may be perceived most readily for touch stimuli that induce high activity in C tactile fibers and low activity in A fibers. Jonsson EH, Backlund Wasling H, Wagnbeck V, Dimitriadis M, Georgiadis JR, Olausson H, and Croy I. Unmyelinated tactile cutaneous nerves signal erotic sensations. J Sex Med 2015;12:1338-1345.

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