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Related Experiment Video

Updated: May 24, 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.

Neurobiology of Learning and Memory
|March 3, 2025
PubMed
Summary

The infralimbic cortex (IL) is crucial for memory control, specifically in suppressing older memories that interfere with new learning. This finding highlights the IL's role in resolving memory interference.

Keywords:
Infralimbic cortexMedial prefrontal cortexMemory retrievalOdor memoryPrelimbic cortex

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Last Updated: May 24, 2025

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Behavioral Neuroscience

Background:

  • The medial prefrontal cortex (mPFC) is vital for memory and behavioral flexibility.
  • Subregions like the prelimbic (PL) and infralimbic (IL) cortex have distinct roles, with PL promoting and IL inhibiting responses.
  • The mPFC is active during high interference, suggesting differing PL and IL roles in resolving it.

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 memory retrieval.

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 specific inactivation of PL or IL regions.

Main Results:

  • Control rats showed impaired retrieval of Set A memories after learning Set B, indicating retroactive interference.
  • PL inactivation did not significantly alter performance compared to controls.
  • IL inactivation prevented the deficit in Set A memory retrieval, suggesting the IL is critical for suppressing interfering memories.

Conclusions:

  • The infralimbic cortex (IL) plays a critical role in memory control by actively suppressing the retrieval of previously acquired, interfering memories.
  • These findings elucidate the specific neural mechanisms underlying memory interference resolution within the medial prefrontal cortex.