Infection, incest, and iniquity: Investigating the neural correlates of disgust and morality

Jana Schaich Borg, Debra Lieberman, Kent A. Kiehl

Research output: Contribution to journalArticlepeer-review

150 Scopus citations

Abstract

Disgust, an emotion related to avoiding harmful substances, has been linked to moral judgments in many behavioral studies. However, the fact that participants report feelings of disgust when thinking about feces and a heinous crime does not necessarily indicate that the same mechanisms mediate these reactions. Humans might instead have separate neural and physiological systems guiding aversive behaviors and judgments across different domains. The present interdisciplinary study used functional magnetic resonance imaging (n = 50) and behavioral assessment to investigate the biological homology of pathogen-related and moral disgust. We provide evidence that pathogen-related and sociomoral acts entrain many common as well as unique brain networks. We also investigated whether morality itself is composed of distinct neural and behavioral subdomains. We provide evidence that, despite their tendency to elicit similar ratings of moral wrongness, incestuous and nonsexual immoral acts entrain dramatically separate, while still overlapping, brain networks. These results (i) provide support for the view that the biological response of disgust is intimately tied to immorality, (ii) demonstrate that there are at least three separate domains of disgust, and (iii) suggest strongly that morality, like disgust, is not a unified psychological or neurological phenomenon.

Original languageEnglish (US)
Pages (from-to)1529-1546
Number of pages18
JournalJournal of cognitive neuroscience
Volume20
Issue number9
DOIs
StatePublished - Sep 2008
Externally publishedYes

ASJC Scopus subject areas

  • Cognitive Neuroscience

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