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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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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...
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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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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The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the cerebellum's...

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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Published on: August 5, 2014

Default network connectivity in medial temporal lobe amnesia.

Scott M Hayes1, David H Salat, Mieke Verfaellie

  • 1Memory Disorders Research Center, VA Boston Healthcare System and Boston University School of Medicine, Boston, Massachusetts 02130, USA. smhayes@bu.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 19, 2012
PubMed
Summary
This summary is machine-generated.

Bilateral medial temporal lobe damage in amnesia selectively impacts the default mode network, altering its connectivity. This study reveals how memory loss affects large-scale brain networks.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Episodic memory and the default mode network (DMN) share overlapping brain regions.
  • The effect of bilateral medial temporal lobe (MTL) damage on the DMN in humans remains largely unknown.

Purpose of the Study:

  • To investigate the impact of bilateral MTL damage on the DMN in amnesic patients.
  • To examine functional connectivity changes within the DMN following MTL lesions.

Main Methods:

  • Resting-state functional magnetic resonance imaging (fMRI) was conducted on patients with amnesia and healthy control participants.
  • Seed-based functional connectivity analyses were employed to assess network integrity.

Main Results:

  • Amnesic patients exhibited robust DMN connectivity in cortical regions (medial prefrontal cortex, posterior medial cortex, lateral parietal cortex) and to residual MTL tissue.
  • Compared to controls, amnesic patients showed decreased posterior cingulate cortex connectivity to the MTL and increased connectivity to cortical DMN regions.
  • Somatomotor network connectivity remained intact, suggesting a selective impact on the DMN.

Conclusions:

  • Bilateral MTL lesions in amnesia selectively disrupt the DMN.
  • Observed changes in DMN connectivity were primarily confined to the MTL subsystem.
  • These findings suggest the DMN may be fractionated into distinct functional and structural components.