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Related Experiment Video

Updated: Aug 22, 2025

Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury
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Longitudinal Patterns of Functional Connectivity in Moderate-to-Severe Traumatic Brain Injury.

Isis So1,2, Liesel-Ann C Meusel2, Bhanu Sharma2,3

  • 1Institute of Medical Science, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.

Journal of Neurotrauma
|November 11, 2022
PubMed
Summary
This summary is machine-generated.

Functional connectivity in the frontoparietal network (FPN) and default mode network (DMN) initially improves after moderate-to-severe traumatic brain injury (TBI) but then declines, suggesting limited recovery potential over time.

Keywords:
functional connectivitylongitudinalmagnetic resonance imagingrecoverytraumatic brain injury

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Neurology

Background:

  • Longitudinal studies are crucial for understanding recovery after moderate-to-severe traumatic brain injury (TBI).
  • Research on longitudinal functional connectivity changes in TBI, particularly in key brain networks, is limited.

Purpose of the Study:

  • To characterize longitudinal functional connectivity patterns in the frontoparietal network (FPN) and default mode network (DMN) in adults with moderate-to-severe TBI.
  • To investigate the temporal dynamics of these network changes and their potential association with injury severity.

Main Methods:

  • Used resting-state functional magnetic resonance imaging (fMRI) in an inception cohort of 40 adults with moderate-to-severe TBI and 17 healthy controls.
  • Employed group independent component analyses and linear mixed-effects modeling with splines to analyze longitudinal network changes over approximately 0.5, 1-1.5, and 3+ years post-injury.

Main Results:

  • Functional connectivity in the right FPN, left FPN, and DMN increased from 0.5 to 1.5 years post-injury, then showed a trend of decreasing connectivity thereafter.
  • Patients with TBI exhibited hypoconnectivity in these networks compared to controls at approximately 0.5 years post-injury.
  • No significant associations were found between network changes and covariates like age, sex, or injury severity.

Conclusions:

  • The findings suggest that compensatory mechanisms in TBI recovery are time-limited, with an initial improvement followed by a decline in functional connectivity.
  • These later reductions in connectivity may mirror observed behavioral and structural declines in chronic TBI.
  • Targeting these late-stage connectivity declines presents a potential new research avenue for improving clinical outcomes in TBI survivors.