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Related Experiment Video

Updated: Feb 7, 2026

How to Detect Amygdala Activity with Magnetoencephalography using Source Imaging

How to Detect Amygdala Activity with Magnetoencephalography using Source Imaging

Published on: June 3, 2013

Neurons Specifically Activated by Fear Learning in Lateral Amygdala Display Increased Synaptic Strength.

C W Butler¹, Y M Wilson¹, J Oyrer²

¹Department of Anatomy and Neuroscience, University of Melbourne, Parkville, VIC 3010, Australia.

|July 21, 2018

Summary

Fear learning activates specific neurons in the lateral amygdala (LA), enhancing synaptic activity. This study provides functional evidence that these activated LA neurons form the basis of fear memory engrams.

Keywords:

amygdala cFos engram fear learning plasticity synapse

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Area of Science:

Neuroscience
Memory Research
Synaptic Plasticity

Background:

The lateral amygdala (LA) is crucial for fear-conditioned memory formation.
Previous research identified fear-learning-activated neurons in the LA using c-fos expression.
Functional evidence linking these activated neurons to memory engrams was previously lacking.

Purpose of the Study:

To provide functional evidence that fear-learning-activated neurons in the LA are part of a memory engram.
To investigate changes in synaptic activity specifically within learning-activated LA neurons.

Main Methods:

Utilized a fos-tau-LacZ (FTL) transgenic mouse line for identifying fear-learning-activated neurons.
Employed a fluorescence-based method to record from FTL neurons in acute brain slices.
Compared spontaneous postsynaptic currents (sPSCs) in activated vs. non-activated FTL neurons and control mice.

Main Results:

Neurons in a restricted LA region showed increased sPSC frequency and amplitude compared to home cage controls.
Fear-learning-activated FTL neurons exhibited higher sPSC frequency and amplitude than non-activated FTL neurons.
No significant learning-induced changes were found in action potential input-output relationships.

Conclusions:

A discrete population of LA neurons activated by fear learning shows enhanced synaptic activity.
These findings support the hypothesis that specific LA neurons, through synaptic changes, constitute a fear memory engram.