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Functional Brain Systems: Limbic System01:15

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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep...
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Updated: May 23, 2025

Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
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Mild Traumatic Brain Injury Impairs Fear Extinction and Network Excitability in the Infralimbic Cortex.

Catherine E Ubri1,2, Anthony M Farrugia2, Akiva S Cohen1,2

  • 1Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.

Journal of Neurotrauma
|May 22, 2025
PubMed
Summary

Mild traumatic brain injury (TBI) impairs fear extinction (FE) memory by disrupting infralimbic cortex (IL) network activity. This study reveals suppressed IL excitability and an excitatory/inhibitory imbalance following mild TBI.

Keywords:
electrophysiologyfear extinctioninfralimbic cortexmicemild traumatic brain injury

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Area of Science:

  • Neuroscience
  • Traumatic Brain Injury Research
  • Behavioral Neuroscience

Background:

  • Mild traumatic brain injury (TBI), or concussion, is a major cause of disability.
  • Persistent neuropsychiatric issues like PTSD, anxiety, and depression are linked to mild TBI.
  • Impaired fear extinction (FE), crucial for inhibiting learned fear, is a hallmark of these conditions.

Purpose of the Study:

  • To investigate the mechanisms by which mild TBI disrupts fear extinction (FE).
  • To examine the effects of mild TBI on infralimbic cortex (IL) network activity and neuronal excitability.

Main Methods:

  • Utilized a mouse model of mild lateral fluid percussion injury.
  • Combined cued-FE behavioral testing, local field potential (LFP) recordings, and whole-cell patch-clamp electrophysiology.
  • Assessed IL network activation, synaptic transmission, and intrinsic neuronal excitability.

Main Results:

  • Mild TBI significantly impaired FE memory, showing increased fear responses post-injury.
  • Reduced activation was observed in IL layers II/III and V networks.
  • An excitatory/inhibitory (E/I) imbalance in the IL, with decreased excitation and increased inhibition, was identified.
  • Mild TBI altered the intrinsic excitability of IL neurons.

Conclusions:

  • Mild TBI suppresses infralimbic cortex (IL) excitability, disrupting the neurocircuitry essential for fear extinction (FE).
  • These findings offer mechanistic insights into fear-based disorders following mild TBI.
  • Understanding IL disruption is key for developing targeted therapeutic strategies.