Neocortical modulation of the amygdala response to fearful stimuli

Ahmad R. Hariri, Venkata Mattay, Alessandro Tessitore, Francesco Fera, Daniel Weinberger

Research output: Contribution to journalArticle

Abstract

Background: The cortical circuitry involved in conscious cognitive processes and the subcortical circuitry involved in fear responses have been extensively studied with neuroimaging, but their interactions remain largely unexplored. A recent functional magnetic resonance imaging (fMRI) study demonstrated that the engagement of the right prefrontal cortex during the cognitive evaluation of angry and fearful facial expressions is associated with an attenuation of the response of the amygdala to these same stimuli, providing evidence for a functional neural network for emotional regulation. Methods: In the current study, we have explored the generalizability of this functional network by using threatening and fearful non-face stimuli derived from the International Affective Picture System (IAPS), as well as the influence of this network on peripheral autonomic responses. Results: Similar to the earlier findings with facial expressions, blood oxygen level dependent fMRI revealed that whereas perceptual processing of IAPS stimuli was associated with a bilateral amygdala response, cognitive evaluation of these same stimuli was associated with attenuation of this amygdala response and a correlated increase in response of the right prefrontal cortex and the anterior cingulate cortex. Moreover, this pattern was reflected in changes in skin conductance. Conclusions: The current results further implicate the importance of neocortical regions, including the prefrontal and anterior cingulate cortices, in regulating emotional responses mediated by the amygdala through conscious evaluation and appraisal.

Original languageEnglish (US)
Pages (from-to)494-501
Number of pages8
JournalBiological Psychiatry
Volume53
Issue number6
DOIs
Publication statusPublished - Mar 15 2003
Externally publishedYes

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Keywords

  • Amygdala
  • Anterior cingulate cortex
  • Emotion regulation
  • Fear
  • Functional magnetic resonance imaging
  • Prefrontal cortex

ASJC Scopus subject areas

  • Biological Psychiatry

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