Cited by 571Tactile and Sensory InteractionsIon Channels and ReceptorsPain Mechanisms and Treatments

Unmyelinated afferents constitute a second system coding tactile stimuli of the human hairy skin

Vallbo, Å. B., Olausson, H., Wessberg, J.·1999·Journal of Neurophysiology

Abstract

Impulses were recorded from unmyelinated afferents innervating the forearm skin of human subjects using the technique of microneurography. Units responding to innocuous skin deformation were selected. The sample (n = 38) was split into low-threshold units (n = 27) and high-threshold units (n = 11) on the basis of three distinctive features, i.e., thresholds to skin deformation, size of response to innocuous skin deformation, and differential response to sharp and blunt stimuli. The low-threshold units provisionally were denoted tactile afferents on the basis of their response properties, which strongly suggest that they are coding some feature of tactile stimuli. They exhibited, in many respects, similar functional properties as described for low-threshold C-mechanoreceptive units in other mammals. However, a delayed acceleration, not previously demonstrated, was observed in response to long-lasting innocuous indentations. It was concluded that human hairy skin is innervated by a system of highly sensitive mechanoreceptive units with unmyelinated afferents akin to the system previously described in other mammals. The confirmation that the system is present in the forearm skin and not only in the face area where it first was identified suggests a largely general distribution although there are indications that the tactile C afferents may be lacking in the very distal parts of the limbs. The functional role of the system remains to be assessed although physiological properties of the sense organs invite to speculations that the slow tactile system might have closer relations to limbic functions than to cognitive and motor functions.

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Crossref · 10.1152/jn.1999.81.6.2753

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  • Affective touch is interoceptive, as it is carried by interoceptive C fibres.

    “of which affective touch is interoceptive, as it is carried by interoceptive C fibres (Vallbo et al., 1999; Wessberg et al., 2003)”

    From Atypical interoception as a common risk factor for psychopathology: A review (2021) · cites this paper as Vallbo et al., 1999

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Authors
Vallbo, Å. B., Olausson, H., & Wessberg, J.
Affiliations
University of Gothenburg (SE)
Venue
Journal of Neurophysiology
Published
1999-06-01
Volume
81
Issue
6
Pages
2753-2763
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W1824892726
Cited by
571
References
45
Citations by year
2026: 27 · 2025: 38 · 2024: 32 · 2023: 32 · 2022: 35 · 2021: 51 · 2020: 36 · 2019: 31 · 2018: 33 · 2017: 30 · 2016: 29 · 2015: 23 · 2014: 23 · 2013: 21 · 2012: 16
FWCI
2.97
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Tactile and Sensory Interactions
  • Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
Keywords
unmyelinated afferents, tactile coding, hairy skin, mechanoreceptors, skin deformation, forearm skin, microneurography
MeSH terms
Adult, Female, Hair, Hot Temperature, Humans, Male, Mechanoreceptors, Myelin Sheath, Nerve Fibers, Neural Conduction, Neurons, Afferent, Physical Stimulation, Sensory Thresholds, Skin, Touch

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