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Related Experiment Video

Updated: Jul 17, 2026

Disrupting Reconsolidation of Fear Memory in Humans by a Noradrenergic β-Blocker

Disrupting Reconsolidation of Fear Memory in Humans by a Noradrenergic β-Blocker

Published on: December 18, 2014

Brain activity associated with fear renewal.

A K Bruchey¹, F Gonzalez-Lima

¹Institute for Neuroscience and Department of Psychology, University of Texas at Austin, Austin, TX 78712, USA.

The European Journal of Neuroscience

|January 19, 2007

Summary

Brain mapping reveals how extinguished fear responses return in new contexts. This study shows specific auditory and sensory brain areas activate during fear renewal, supporting Pavlov's theory.

Area of Science:

Neuroscience
Behavioral Neuroscience
Learning and Memory

Background:

Conditioned fear responses can return even after extinction.
Context-dependent fear renewal is a significant phenomenon in learning and memory.
The neural underpinnings of fear renewal remain incompletely understood.

Purpose of the Study:

To map brain activity associated with context-dependent renewal of extinguished conditioned fear responses.
To identify specific brain regions involved in the renewal effect.
To investigate the neural mechanisms supporting Pavlov's stimulus-substitution theory in fear renewal.

Main Methods:

Utilized [18F]FDG (fluorodeoxyglucose) autoradiography in rats to map brain glucose metabolism.
Established a fear conditioning paradigm with extinction and context-dependent renewal.

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Disrupting Reconsolidation of Fear Memory in Humans by a Noradrenergic β-Blocker

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Published on: December 18, 2014

Extinction Training During the Reconsolidation Window Prevents Recovery of Fear

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Published on: August 24, 2012

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

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

Published on: October 6, 2011

Compared brain activity between rats exhibiting fear renewal and control subjects.

Main Results:

Increased tone-evoked [18F]FDG uptake was observed in auditory system nuclei (auditory cortex, medial geniculate, inferior colliculus, lateral lemniscal nuclei).
Elevated activity was also found in somatic and visceral sensory nuclei (external cuneate, spinal trigeminal, solitary tract, vestibular nuclei).
The perirhinal cortex, anterior lateral hypothalamus, and ventrolateral periaqueductal gray showed significant renewal effects, with external cuneate nucleus activity predicting behavioral response.

Conclusions:

Context-dependent fear renewal involves activation of auditory pathways for conditioned stimulus processing.
It also involves associative activation of sensory pathways representing the unconditioned stimulus, even without its presence.
Neural activation in the perirhinal cortex, hypothalamus, and periaqueductal gray contributes to the renewal effect, supporting stimulus-substitution theory.