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Related Experiment Video

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Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
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Visual Working Memory Encoding and Recognition in Good Outcome Aneurysmal Subarachnoid Patients.

Leodante da Costa1, Priyanka P Shah-Basak2,3, Benjamin T Dunkley2,4

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Summary

Survivors of aneurysmal subarachnoid hemorrhage (aSAH) show increased brain activity in memory centers, even with normal imaging. This heightened neuronal activation in the cingulate gyri may compensate for underlying brain injury during visual working memory tasks.

Keywords:
aneurysmencodingmagnetoencephalographyrecognitionsubarachnoid hemorrhageworking memory

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Area of Science:

  • Neuroscience
  • Neurology
  • Medical Imaging

Background:

  • Aneurysmal subarachnoid hemorrhage (aSAH) leads to significant disability, with survivors frequently experiencing neurocognitive deficits.
  • These cognitive issues can persist despite normal structural imaging, suggesting underlying neurophysiological alterations.

Purpose of the Study:

  • To investigate neurophysiological function during a visual working memory task in aSAH survivors with good recovery and normal structural imaging.
  • To identify alterations in neuronal activity and connectivity using magnetoencephalography (MEG).

Main Methods:

  • Recruited aSAH patients (treated with coiling, good GOS, normal MRI) and age/sex-matched controls.
  • Administered cognitive screening, structural MRI, and MEG during a 1-back visual working memory task.
  • Analyzed sensor-level global field power and virtual electrode source analysis for neuronal activity and connectivity.

Main Results:

  • Thirteen aSAH patients and 13 controls completed the study.
  • aSAH patients showed similar accuracy but a trend towards longer reaction times on the working memory task.
  • Significantly increased neuronal activation and hyperconnectivity were observed in the anterior and posterior cingulate gyri during memory tasks.

Conclusions:

  • aSAH patients exhibit increased neuronal activity in the anterior and posterior cingulate gyri during visual working memory tasks, despite normal structural imaging.
  • This hyperactivity in key memory hubs may represent a compensatory mechanism for neuronal injury and network dysfunction.
  • Findings highlight the utility of MEG in detecting subclinical neurophysiological changes post-aSAH.