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Related Concept Videos

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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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
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Default mode network functional and structural connectivity after traumatic brain injury.

David J Sharp1, Christian F Beckmann, Richard Greenwood

  • 1The Hammersmith Hospital, London, W12 0NN, UK. david.sharp@imperial.ac.uk

Brain : a Journal of Neurology
|August 16, 2011
PubMed
Summary
This summary is machine-generated.

Traumatic brain injury alters brain network connectivity, impacting cognitive function. Increased default mode network connectivity may compensate for white matter damage, but this relationship is complex and influences recovery.

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Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury
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Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury

Published on: August 14, 2019

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Radiology

Background:

  • Traumatic brain injury (TBI) frequently causes cognitive impairments, hindering patient recovery.
  • The exact pathophysiology of these cognitive deficits remains unclear, limiting effective clinical interventions.
  • Understanding brain network alterations is crucial for assessing and managing TBI-related cognitive dysfunction.

Purpose of the Study:

  • To investigate abnormalities in functional connectivity within cognitive networks after TBI.
  • To determine if these functional connectivity changes correlate with cognitive performance.
  • To examine the influence of diffuse axonal injury on structural and functional connectivity.

Main Methods:

  • Used functional magnetic resonance imaging (fMRI) to analyze brain activation and functional connectivity during rest and a cognitive task.
  • Employed diffusion tensor imaging (DTI) to quantify white matter damage (diffuse axonal injury).
  • Compared 20 chronic TBI patients with age-matched controls.

Main Results:

  • TBI patients exhibited slower, more variable responses and greater default mode network (DMN) deactivation during a task.
  • Resting-state fMRI revealed increased DMN functional connectivity in TBI patients.
  • Higher DMN functional connectivity correlated with less severe cognitive impairment and predicted task-related activation patterns.
  • Widespread white matter damage was observed in TBI patients, with reduced DMN functional connectivity linked to diffuse axonal injury.

Conclusions:

  • TBI alters functional connectivity in cognitive networks, particularly the DMN.
  • Increased DMN functional connectivity may represent a compensatory mechanism for cognitive load and white matter damage.
  • Structural integrity of white matter directly influences DMN functional connectivity and subsequent cognitive function post-TBI.