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Related Experiment Video

Updated: Jun 9, 2026

Investigating the Neural Mechanisms of Aware and Unaware Fear Memory with fMRI
12:51

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Published on: October 6, 2011

A neural switch for active and passive fear.

Alessandro Gozzi1, Apar Jain, Aldo Giovannelli

  • 1Neurosciences CEDD, GlaxoSmithKline Medicines Research Centre, via Fleming 4, 37135 Verona, Italy.

Neuron
|August 28, 2010
PubMed
Summary

Researchers identified a neural circuit in the central nucleus of the amygdala (CeA) that controls fear responses. Inhibiting specific CeA neurons altered mouse behavior from passive freezing to active coping strategies.

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Computational Neuroscience

Background:

  • The central nucleus of the amygdala (CeA) is a key brain region for processing and expressing conditioned fear.
  • Understanding the downstream neural circuits of the CeA is crucial for deciphering fear expression mechanisms.

Purpose of the Study:

  • To identify specific neural circuits originating from the CeA that regulate the expression of conditioned fear behaviors in mice.
  • To investigate the role of these circuits in biasing fear responses towards passive or active coping strategies.

Main Methods:

  • Utilized cell- and tissue-specific pharmacogenetic inhibition to selectively target CeA neurons.
  • Employed functional magnetic resonance imaging (fMRI) to visualize brain activity and functional connectivity.
  • Conducted correlation analysis of fMRI signals to map circuit interactions.
  • Administered cholinergic antagonists to assess the role of cholinergic systems.

Main Results:

  • Selective inhibition of a subset of CeA neurons decreased conditioned freezing behavior.
  • fMRI revealed increased cortical arousal upon CeA neuron inhibition.
  • Functional connectivity was identified between the CeA, cholinergic forebrain, and cortical areas.
  • Cholinergic antagonists blocked the observed cortical arousal.
  • Inhibition of these CeA neurons shifted behavioral responses from passive to active coping.

Conclusions:

  • A specific neural circuit within the CeA dictates the balance between passive and active coping strategies during fear responses.
  • Cholinergic systems play a significant role in mediating CeA-driven cortical arousal and behavioral output.
  • These findings provide novel insights into the neural substrates controlling adaptive fear responses.