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Extinction resistant changes in the human auditory association cortex following threat learning.

Annemieke M Apergis-Schoute1, Daniela Schiller2, Joseph E LeDoux3

  • 1Behavioural and Clinical Neuroscience Institute, University of Cambridge, Cambridge, UK; Department of Psychiatry, University of Cambridge, Cambridge, UK.

Neurobiology of Learning and Memory
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Summary

This study reveals lasting changes in the human brain after fear extinction. Enhanced brain activity in the auditory cortex to threat stimuli persists even when fear responses subside.

Keywords:
Auditory fear conditioningFear conditioningFear extinction

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychology

Background:

  • The amygdala is crucial for processing emotions and modulating cortical activity in humans.
  • Animal studies show threat learning causes long-lasting cortical changes, even after fear extinction.

Purpose of the Study:

  • To investigate the neural mechanisms of long-lasting threat conditioning traces in the human brain.
  • To explore cortical plasticity following threat extinction in humans.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Skin conductance responses (SCR) were assessed during threat acquisition, extinction learning, and retrieval.
  • Blood oxygen level-dependent (BOLD) signal changes were analyzed in relation to threat stimuli.

Main Results:

  • Evidence of lasting cortical plasticity in the human brain after threat extinction was found.
  • An enhanced BOLD signal to learned threat stimuli in the auditory association cortex was resistant to extinction.
  • These findings suggest a mechanism for persistent cortical processing of danger cues.

Conclusions:

  • Threat extinction in humans leads to enduring cortical plasticity.
  • Cortical processing of learned threat stimuli can remain heightened independently of amygdala activity and fear responses.
  • This highlights a parallel pathway for long-lasting fear memory consolidation in the human brain.