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Related Experiment Video

Updated: May 26, 2026

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

Published on: April 5, 2016

Memory coding in plastic neuronal subpopulations within the amygdala.

Hiroshi Nomura¹, Ayako Nonaka, Natsuko Imamura

¹Laboratory of Chemical Pharmacology Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan. nomura@mol.f.u-tokyo.ac.jp

|December 31, 2011

Summary

This summary is machine-generated.

Different contextual fear memories involve partly overlapping neuronal populations in the lateral amygdala. A small subset of neurons uniquely encodes each specific fear memory, demonstrating plasticity in neural representations.

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Last Updated: May 26, 2026

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

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Published on: April 5, 2016

$Combined Optogenetic and Freeze-fracture Replica Immunolabeling to Examine Input-specific Arrangement of Glutamate Receptors in the Mouse Amygdala$

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Trace Fear Conditioning in Mice

Trace Fear Conditioning in Mice

Published on: March 20, 2014

Area of Science:

Neuroscience
Memory Research
Cellular Imaging

Background:

Specific neuronal subpopulations in distinct brain regions are crucial for learning and memory.
A fear memory involves a subset of lateral amygdala neurons, but representation of multiple fear memories is not well understood.

Purpose of the Study:

To investigate how multiple contextual fear memories are represented in the amygdala at the cellular and temporal level.
To determine if different contextual fear memories engage the same or distinct subsets of lateral amygdala neurons.

Main Methods:

Utilized large-scale imaging in mice conditioned with footshocks in separate chambers.
Assessed neuronal activity via the subcellular distribution of Arc/Arg3.1 RNA upon re-exposure to conditioning chambers.
Analyzed neuronal overlap during reactivation of the same or different fear memories.

Main Results:

Reactivation of different memories showed partial overlap (approx. 50%) in activated lateral amygdala neurons.
Reactivation of the same memory exhibited greater overlap (approx. 65%) in activated neurons.
A small neuronal population (2.7%) uniquely encoded differences between individual fear memories.
Memory retrieval expanded the activated neuronal subpopulation for subsequent retrieval.

Conclusions:

Lateral amygdala neurons for different fear memories are partially shared.
Distinct subsets of neurons encode unique contextual fear memories, highlighting neural plasticity.
Memory retrieval dynamically modifies the size of activated neuronal ensembles.