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Updated: Jun 9, 2025

A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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The Infralimbic, but not the Prelimbic Cortex is needed for a Complex Olfactory Memory Task.

Dahae J Jun1, Rebecca Shannon1, Katherine Tschida1

  • 1Department of Psychology, Cornell University, 211 Uris Hall Ithaca, NY 14853 United States.

Biorxiv : the Preprint Server for Biology
|October 28, 2024
PubMed
Summary
This summary is machine-generated.

The infralimbic cortex (IL) is crucial for memory control. Suppressing IL activity prevented retroactive interference, indicating its role in inhibiting old memories during new learning.

Keywords:
infralimbic cortexmedial prefrontal cortexmemory retrievalodor memoryprelimbic cortex

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Behavioral Neuroscience

Background:

  • The medial prefrontal cortex (mPFC) is vital for memory and behavioral flexibility.
  • Distinct subregions, prelimbic (PL) and infralimbic (IL), have proposed differential roles in memory retrieval and inhibition.

Purpose of the Study:

  • To investigate the specific roles of the PL and IL subregions of the mPFC in resolving memory interference.
  • To determine if the IL is involved in suppressing previously acquired memories that interfere with new learning.

Main Methods:

  • Chemogenetics (DREADDs) were used to suppress neuronal activity in the mPFC.
  • Rats were trained on a conditional discrimination task with conflicting odor discrimination problems (Sets A and B).
  • A mid-session switch tested memory retrieval under high interference conditions, with PL and IL inactivation examined.

Main Results:

  • Control rats showed impaired retrieval of Set A memories after learning Set B, indicating retroactive interference.
  • PL inactivation did not alter performance compared to controls.
  • IL inactivation abolished the retroactive interference effect, suggesting a critical role for the IL in memory suppression.

Conclusions:

  • The infralimbic cortex (IL) plays a critical role in memory control processes necessary for resolving interference.
  • The IL appears to be essential for actively suppressing the retrieval of previously learned memories that conflict with current goals.