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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Transient global amnesia (TGA) is a temporary memory disorder.
  • Spatial orientation relies on hippocampal and extrahippocampal networks.
  • Understanding TGA's long-term neurological impact is crucial.

Purpose of the Study:

  • To assess long-term recovery of allocentric and egocentric spatial orientation after TGA.
  • To evaluate spatial orientation as a marker for hippocampal and extrahippocampal network function.
  • To investigate compensatory brain activation patterns in TGA patients.

Main Methods:

  • 18 TGA patients and 12 controls performed real-space navigation tasks (allocentric and egocentric).
  • Navigation performance and strategy were assessed at 3 days and 3 months post-TGA.
  • Brain activity during navigation was measured using [18F]-fluorodeoxyglucose-PET in 8 TGA patients.

Main Results:

  • TGA patients showed significant allocentric, but not egocentric, navigation deficits in the postacute stage.
  • Allocentric deficits persisted at follow-up, with increased landmark fixations and reduced shortcut use.
  • PET revealed increased navigation-induced brain activation in hippocampal and cortical regions in TGA patients.

Conclusions:

  • TGA leads to selective, prolonged allocentric spatial orientation impairments.
  • Hippocampal and extrahippocampal networks show altered activation to compensate for navigation deficits.
  • Spatial orientation deficits serve as a sensitive marker for TGA-related network dysfunction.