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Traumatic Brain Injury l: Introduction01:28

Traumatic Brain Injury l: Introduction

DefinitionTraumatic brain injury, or TBI, is a disturbance of normal brain function induced by an external mechanical force, such as a direct blow to the head or a penetrating injury. It can affect both brain structure and function, producing a wide range of clinical outcomes. TBI is a heterogeneous condition, meaning its effects may differ based on the type, location, and severity of the injury.Basis of ClassificationTBI is classified based on severity, injury mechanism, or pathophysiology. In...

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Altered bidirectional plasticity and reduced implicit motor learning in concussed athletes.

Louis De Beaumont1, Sébastien Tremblay, Judes Poirier

  • 1Centre de Recherche en Neuropsychologie et Cognition (CERNEC), Department of Psychology Université de Montréal, Montréal, Québec, Canada.

Cerebral Cortex (New York, N.Y. : 1991)
|May 17, 2011
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Summary

Repeated concussions in youth may impair learning by increasing GABAergic inhibition, which suppresses synaptic plasticity (long-term potentiation/depression) in the motor cortex. This finding links brain injury to altered neurotransmission and learning deficits.

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Area of Science:

  • Neuroscience
  • Sports Medicine
  • Traumatic Brain Injury Research

Background:

  • Recurrent sports concussions cause persistent cognitive and motor deficits, increasing Alzheimer's disease risk.
  • Traumatic brain injury (TBI) in animal models links impaired learning to suppressed synaptic plasticity, specifically long-term potentiation (LTP) and long-term depression (LTD).
  • Human studies show repeated concussions elevate gamma-aminobutyric acid (GABA)-mediated inhibition, suppressing LTP/LTD.

Purpose of the Study:

  • To investigate if increased GABAergic inhibition after repeated concussions suppresses synaptic plasticity and impairs learning.
  • To test the hypothesis linking GABA alterations to learning deficits post-concussion.

Main Methods:

  • Used paired associative stimulation (PAS) to induce LTP/LTD-like effects in the primary motor cortex (M1).
  • Administered an implicit motor learning task (serial reaction time task, SRTT).
  • Assessed GABA(B)-mediated intracortical inhibition and its association with synaptic plasticity and motor learning.

Main Results:

  • Repeated concussions led to persistent elevations in GABA(B)-mediated inhibition in M1.
  • This increased inhibition was associated with suppressed PAS-induced LTP/LTD-like synaptic plasticity.
  • Suppressed plasticity correlated with reduced implicit motor learning on the SRTT task compared to controls.

Conclusions:

  • Repeated concussions cause lasting alterations in GABA neurotransmission within the motor cortex.
  • Impaired learning following multiple concussions may stem partly from compromised GABA-dependent synaptic plasticity (LTP/LTD).
  • Findings highlight GABAergic mechanisms contributing to persistent deficits after youth sports concussions.