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Modulating interoception by insula stimulation: A double-blinded tDCS study.

Laura Sagliano1, Alfonso Magliacano1, Marta Parazzini2

  • 1Department of Psychology, University of Campania 'Luigi Vanvitelli', Viale Ellittico 31, 81100 Caserta, Italy.

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Summary
This summary is machine-generated.

This study investigated the insula

Keywords:
Brain stimulationHeartbeat counting taskInsulaInteroceptiontDCS

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Interoception is the perception of internal body signals, like heartbeats.
  • Previous research linked heartbeat attention to insula and premotor activation.

Purpose of the Study:

  • To investigate the insula's role in interoception.
  • To assess how transcranial direct current stimulation (tDCS) affects interoceptive accuracy.

Main Methods:

  • Healthy participants underwent tDCS targeting the left insula, right insula, or sham.
  • Heartbeat perception accuracy was measured using a heartbeat counting task before and after stimulation.

Main Results:

  • A significant improvement in interoceptive accuracy occurred only in the sham stimulation condition.
  • Stimulation of the insula did not enhance, but rather reduced, the ability to improve heartbeat detection accuracy.

Conclusions:

  • The insula may play a role in regulating interoceptive processing.
  • Direct current stimulation over the insula appears to impair, rather than improve, interoceptive accuracy.