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Related Concept Videos

Autobiographical Memory01:14

Autobiographical Memory

Autobiographical memory is a unique type of episodic memory that involves recollecting personal life experiences. It allows individuals to remember significant events from their past, creating a narrative of their lives. One interesting phenomenon related to autobiographical memory is the reminiscence bump. This effect refers to the tendency of adults to recall more events from their second and third decades of life — typically between ages 10 to 30 — than from other periods. This period is...
Explicit Memories01:27

Explicit Memories

Explicit memories, also known as declarative memories, are consciously remembered, recalled, and reported. Studying for a chemistry exam involves material that will become part of explicit memory. There are two types of explicit memory: episodic and semantic.
Episodic memory contains information about personally experienced events and is reported as a story. An example of episodic memory is recalling a birthday celebration. This type of memory includes the what, where, and when of an event, as...
Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

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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Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
Long-Term Memory01:18

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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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Eyewitness Memory01:22

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Eyewitness memory refers to the recollection of events by someone who has directly witnessed them, often serving as critical evidence in legal settings. This type of memory is commonly used in criminal cases where a witness describes details like a suspect's appearance, clothing, or behavior during a crime. However, despite its perceived reliability, eyewitness memory is prone to significant errors.
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Related Experiment Video

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Brain Imaging Investigation of the Neural Correlates of Emotional Autobiographical Recollection
11:30

Brain Imaging Investigation of the Neural Correlates of Emotional Autobiographical Recollection

Published on: August 26, 2011

Autobiographical memory in semantic dementia: a longitudinal fMRI study.

Eleanor A Maguire1, Dharshan Kumaran, Demis Hassabis

  • 1Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, 12 Queen Square, London WC1N 3BG, UK. e.maguire@fil.ion.ucl.ac.uk

Neuropsychologia
|September 2, 2009
PubMed
Summary

Semantic dementia (SD) gradually impacts autobiographical memory, initially compensated by brain network changes. Functional MRI (fMRI) reveals distinct stages of memory decline in SD patients.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Semantic dementia (SD) primarily affects semantic memory and language.
  • The impact of SD on autobiographical memory is less understood.
  • Functional MRI (fMRI) identifies brain networks crucial for autobiographical memory in healthy individuals.

Observation:

  • This study longitudinally tracked autobiographical memory recall in one SD patient (AM) using fMRI over three years.
  • AM initially had intact autobiographical memory, followed by a gradual decline in recollective quality.
  • No temporal gradient was observed in memory loss.

Findings:

  • Initially, AM's recall engaged the typical autobiographical memory network, including affected hippocampus and temporal neocortex.
  • Compensation occurred through increased activity in prefrontal cortex, temporal cortex, and precuneus.
  • A late-stage shift in brain activity preceded the complete loss of autobiographical memory.

Implications:

  • Findings contribute to understanding the roles of the hippocampus and neocortex in remote memory.
  • Suggests potential for defining SD progression stages using fMRI.
  • fMRI may offer prognostic and rehabilitative insights for SD care, complementing existing measures.