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Related Experiment Video

Updated: May 23, 2026

Conditional Genetic Transsynaptic Tracing in the Embryonic Mouse Brain

Conditional Genetic Transsynaptic Tracing in the Embryonic Mouse Brain

Published on: December 22, 2014

Generation of a synthetic memory trace.

Aleena R Garner¹, David C Rowland, Sang Youl Hwang

¹Department of Cell Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.

Science (New York, N.Y.)

|March 24, 2012

Summary

Mice formed hybrid memories by artificially activating specific neurons during fear conditioning. This artificial neural network activation was essential for memory recall, demonstrating its role in memory encoding.

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Area of Science:

Neuroscience
Memory Research
Behavioral Neuroscience

Background:

Contextual fear memory is crucial for survival.
Understanding the neural basis of memory encoding is a key challenge in neuroscience.
Artificial neural activation offers a novel tool to probe memory formation.

Purpose of the Study:

To investigate how artificially activating a competing neural representation affects contextual fear memory encoding in mice.
To determine if artificial neural stimulation can create hybrid memory representations.
To explore the necessity of reactivating artificially stimulated networks for memory retrieval.

Main Methods:

Utilized a c-fos-based transgenic approach to express hM(3)D(q) DREADD receptors in mouse neurons.
Artificially activated specific neuronal ensembles using an exogenous ligand in a distinct context during fear conditioning.
Assessed memory retrieval and specificity based on the artificially stimulated neuronal patterns.

Main Results:

Mice formed a hybrid memory representation when an ensemble of neurons was artificially activated during conditioning in a separate context.
Reactivation of the artificially stimulated network was required for memory retrieval.
The formed memory was specific to the spatial pattern of neurons artificially activated during learning.
Similar artificial stimulation, when not part of initial conditioning, impaired recall.

Conclusions:

Artificial activation of neural ensembles can directly influence and shape the encoding of contextual fear memories.
This study provides evidence for the specificity of memory traces linked to artificially induced neural activity.
The findings highlight the potential of targeted neural stimulation techniques for dissecting memory mechanisms.