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Interoceptive Brain Processing Influences Moral Decision Making.

Shengbin Cui1, Tamami Nakano2,3

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Summary
This summary is machine-generated.

This study shows the brain uses internal body signals, measured by heartbeat-evoked potentials (HEPs), to guide moral decisions between utilitarian and deontological choices. These internal signals influence how we process moral dilemmas.

Keywords:
EEGalexithymiaheartbeat‐evoked potentialinteroceptionmoral decision‐making

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Area of Science:

  • Neuroscience
  • Moral Psychology
  • Cognitive Science

Background:

  • Moral decision-making involves balancing consequences (utilitarianism) and actions (deontology).
  • Interoception, the sense of the body's internal state, may influence complex cognitive processes like moral judgment.
  • Heartbeat-evoked potentials (HEPs) provide a neural measure of cardiac interoception.

Purpose of the Study:

  • To investigate the role of interoceptive processing in neural mechanisms underlying utilitarian versus deontological moral decision-making.
  • To examine how cardiac interoception, via HEPs, differentiates neural responses to moral dilemmas.

Main Methods:

  • Utilized electroencephalogram (EEG) and electrocardiogram (ECG) to record neural and cardiac activity.
  • Participants (N=27) made utilitarian and deontological decisions for personal and impersonal moral dilemmas.
  • Analyzed heartbeat-evoked potentials (HEPs) during scenario presentation and decision phases.

Main Results:

  • No significant differences in HEPs were found between personal and impersonal moral dilemmas.
  • Differential HEPs were observed between utilitarian and deontological moral decision-making, irrespective of dilemma type.
  • Specific differences in HEP amplitude occurred during scenario and decision phases over distinct brain regions, confirmed to be non-artifactual.

Conclusions:

  • Interoceptive processing, as reflected by HEPs, plays a distinct role in differentiating utilitarian from deontological moral decision-making.
  • The brain integrates interoceptive signals to inform subsequent moral judgments.
  • These findings highlight the neural basis of how bodily states influence complex moral cognition.