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Related Concept Videos

Amnesia01:13

Amnesia

Amnesia is a condition marked by long-term memory loss, which impairs the ability to recall past events or create new memories.
The severity and duration of memory loss vary depending on the type and underlying cause. Amnesia is classified into two main types: retrograde and anterograde.
Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...
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Higher Mental Functions of Brain: Learning and Memory

Memory is one of the most vital higher mental functions of the brain. Memory is closely related to learning because it enables us to retain information and experiences from our past to use them in our present life. It also helps us to remember facts, events, and skills, such as riding a bike or swimming. There are two types of memory — declarative memory, which involves memorizing facts or events, and procedural memory, which enables us to remember how to do something like writing or playing an...
Dissociative Amnesia01:21

Dissociative Amnesia

Dissociative amnesia is a complex psychological condition that manifests as an inability to recall personal information, often tied to traumatic or stressful events. Unlike general amnesia, individuals with this condition retain the ability to perform routine activities and procedural tasks, such as operating a phone or navigating public transportation, yet experience profound gaps in autobiographical memory. These lapses may encompass significant life events, such as suicide attempts or...
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A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
Role of Hippocampus in Memory01:19

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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
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A Comprehensive Protocol for Manual Segmentation of the Medial Temporal Lobe Structures
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Transient global amnesia: functional anatomy and clinical implications.

Thorsten Bartsch1, Günther Deuschl

  • 1Department of Neurology, University Hospital Schleswig-Holstein, University of Kiel, Kiel, Germany. t.bartsch@neurologie.uni-kiel.de

The Lancet. Neurology
|February 5, 2010
PubMed
Summary

Transient global amnesia (TGA) involves temporary hippocampal dysfunction, likely due to CA1 neuron vulnerability to metabolic stress. This review explores TGA

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Published on: November 19, 2012

Area of Science:

  • Neurology
  • Neuroimaging
  • Cellular Neuroscience

Background:

  • Transient global amnesia (TGA) is a clinically enigmatic neurological syndrome.
  • Recent MRI studies implicate hippocampal dysfunction, specifically CA1 lesions, in TGA.
  • The precise triggers for these lesions remain elusive.

Purpose of the Study:

  • To review the clinical features of TGA.
  • To discuss novel neuroimaging findings in TGA.
  • To explore the cellular mechanisms underlying TGA pathophysiology.

Main Methods:

  • Review of clinical data.
  • Analysis of recent MRI findings.
  • Synthesis of clinical-epidemiological data.

Main Results:

  • Focal diffusion lesions in the hippocampal CA1 field correlate with TGA.
  • CA1 neuron vulnerability to metabolic stress is a key factor.
  • Various potential triggers like migraine and ischemia are considered.

Conclusions:

  • TGA is characterized by transient hippocampal CA1 dysfunction.
  • Metabolic stress vulnerability of CA1 neurons is central to TGA.
  • Further research is needed to fully elucidate TGA triggers and mechanisms.