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Compensatory Limb Use and Behavioral Assessment of Motor Skill Learning Following Sensorimotor Cortex Injury in a Mouse Model of Ischemic Stroke
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Injury patterns associated with cognitive motor dissociation.

Eva Franzova1, Qi Shen1, Kevin Doyle1

  • 1Department of Neurology, Columbia University Medical Center, NewYork-Presbyterian Hospital, New York, NY, USA.

Brain : a Journal of Neurology
|August 13, 2023
PubMed
Summary
This summary is machine-generated.

Cognitive motor dissociation (CMD) in brain injury patients indicates potential recovery. This study links specific brain lesion patterns and network dysfunction to CMD, suggesting anterior forebrain mesocircuit integration failure.

Keywords:
MRIcognitive motor dissociationelectroencephalographyimagingstructural injury

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Area of Science:

  • Neuroscience
  • Neurology
  • Medical Imaging

Background:

  • Cognitive motor dissociation (CMD) in unresponsive acute brain injury patients predicts functional recovery.
  • CMD detection via EEG and machine learning has clinical implications but underlying mechanisms are unknown.
  • Understanding CMD mechanisms is crucial for patient care and therapeutic guidance.

Purpose of the Study:

  • To test the hypothesis that CMD results from a failure to integrate comprehended motor commands with motor outputs.
  • To analyze structural lesion patterns and network dysfunction in patients with and without CMD.
  • To identify potential neuroimaging markers for CMD screening.

Main Methods:

  • Manual segmentation of MRI sequences (T2-FLAIR, DWI) to quantify structural injury in 107 patients.
  • Lesion pattern analysis to identify commonalities in CMD (n=21) and non-CMD (n=86) groups.
  • Assessment of thalamocortical and cortico-cortical network connectivity using EEG (ABCD classification, WPPC).

Main Results:

  • Distinct lesion patterns were identified for CMD and non-CMD groups; midbrain lesions were absent in CMD patients.
  • CMD patients with subcortical lesions showed preserved thalamocortical network function but altered long-range cortico-cortical connectivity.
  • Patients with bilateral cortical lesions and CMD showed preserved cortico-cortical network function.

Conclusions:

  • Failure of motor command integration at the anterior forebrain mesocircuit level underlies CMD in patients with subcortical lesions.
  • Preserved cortico-cortical network function is associated with CMD detection in patients with bilateral cortical lesions.
  • Structural MRI and resting EEG may enable CMD screening.