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Charlotte Krahé1, Marianne M Drabek2, Yannis Paloyelis3

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Affective touch modulates pain perception, with C tactile (CT) fibers influencing early and late pain processing stages. Attachment styles significantly alter how pleasant touch affects pain responses.

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Area of Science:

  • Neuroscience
  • Psychology
  • Interoception research

Background:

  • Affective touch and pain are key interoceptive sub-modalities with distinct affective and social implications.
  • The direct relationship between affective touch and pain processing, particularly the role of the C tactile (CT) system, remains under-investigated.

Purpose of the Study:

  • To investigate the role of affective touch, specifically CT fiber stimulation, in modulating subjective and electrophysiological responses to noxious stimuli.
  • To examine how individual attachment styles influence the interaction between affective touch and pain perception.

Main Methods:

  • Fifty women underwent noxious skin stimulation while receiving pleasant, slow-velocity touch on CT-containing (arm) and non-CT-containing (palm) skin.
  • Subjective pain ratings and laser-evoked potentials (N1, N2-P2) were recorded.
  • Individual attachment styles (anxiety and avoidance) were assessed.

Main Results:

  • On non-CT skin, higher attachment anxiety correlated with increased pain ratings and N2 amplitude.
  • On CT-containing skin, higher attachment anxiety predicted attenuated N1 and N2 amplitudes.
  • Higher attachment avoidance showed opposite effects, indicating attachment-dependent modulation of pain processing by CT-based touch.

Conclusions:

  • CT-based affective touch modulates pain at both early (N1) and late (N2) processing stages, with effects contingent on attachment style.
  • Affective touch not involving CT fibers primarily impacts conscious pain perception, potentially via socio-cognitive pathways.
  • Affective touch may signal social support, gating pain responses based on individual expectations.