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Changes in interoceptive processes following brain stimulation.

Olga Pollatos1, Beate M Herbert2, Sandra Mai3

  • 1Clinical and Health Psychology, Institute of Psychology and Education, Ulm University, Albert Einstein Allee 41, Ulm, Germany olga.pollatos@uni-ulm.de.

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Summary
This summary is machine-generated.

Inhibiting specific brain regions, like the anterior insula, impacts interoceptive accuracy and confidence. This study demonstrates how repetitive transcranial magnetic stimulation (rTMS) can reveal neural underpinnings of interoception.

Keywords:
HEPTMSinsulainteroceptioninteroceptive accuracysomatosensory cortex

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychophysiology

Background:

  • Interoception, the perception of internal bodily signals, involves complex processing levels.
  • The heartbeat-evoked potential (HEP) is a key measure for automatic cardiac signal processing.
  • Understanding the neural basis of interoception requires targeted brain modulation.

Purpose of the Study:

  • To investigate the neural structures supporting interoceptive processing.
  • To examine the effects of inhibiting the right anterior insula and somatosensory cortices on interoception.
  • To assess the impact on interoceptive accuracy (IAc), perception confidence, and HEP.

Main Methods:

  • Utilized repetitive transcranial magnetic stimulation (rTMS) with a continuous theta-burst protocol (cTBS).
  • Targeted inhibition of the right anterior insula and right somatosensory cortices in 18 male participants.
  • Assessed effects on cardiac and respiratory interoceptive accuracy, perception confidence, and HEP amplitude.

Main Results:

  • Inhibiting the anterior insula decreased cardiac and respiratory IAc and perception confidence.
  • cTBS over somatosensory cortices reduced cardiac IAc and perception confidence.
  • Inhibition of both regions increased interoceptive sensibility and reduced HEP amplitude.

Conclusions:

  • Repetitive transcranial magnetic stimulation (rTMS) is effective for probing the interoceptive neural network.
  • The right anterior insula and somatosensory cortices play distinct roles in interoceptive processing.
  • Findings contribute to understanding the neural basis of affect, cognition, and mental health through interoception.