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Deactivation of default mode network during touch.

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Interpersonal touch, unlike impersonal touch, strongly activates brain regions for social processing. Both types of touch deactivate the default mode network (DMN), explaining touch's attention-grabbing nature.

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Area of Science:

  • Neuroscience
  • Social Psychology
  • Affective Science

Background:

  • Interpersonal touch has a significant affective component that captures attention.
  • Neural processing of touch involves C-tactile nerve fibers, activating somatosensory and social processing regions like the superior temporal gyrus (STG).
  • The default mode network (DMN) is implicated in self-referential thought and is often deactivated during externally focused tasks.

Purpose of the Study:

  • To investigate if interpersonal touch causes greater deactivation of the DMN compared to impersonal touch.
  • To explore the neural mechanisms underlying the attention-grabbing effect of interpersonal touch.
  • To examine the role of stroking velocity in modulating neural responses to touch.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to study brain activity in 30 healthy adults.
  • Participants received either interpersonal touch (experimenter's palm) or impersonal touch (brush) on the forearm.
  • Stroking velocity was varied to modulate C-tactile nerve fiber activation.

Main Results:

  • Interpersonal touch was perceived as more pleasant and intense than impersonal touch.
  • Both touch types led to increased blood oxygen level dependent (BOLD) signal in the somatosensory cortex (SII) and superior temporal cortex.
  • All touch conditions were associated with deactivation of DMN nodes; however, no significant differences in DMN deactivation were found between interpersonal and impersonal touch or across different stroking velocities.

Conclusions:

  • All tested touch conditions effectively deactivate the default mode network (DMN).
  • The coupling of somatosensory and social processing areas with DMN deactivation likely underlies the attention-grabbing effect of touch.
  • The findings suggest that the brain's response to touch, regardless of social context, involves a shift away from self-referential processing.