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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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Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual...
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Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
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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...
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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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Related Experiment Video

Updated: Oct 11, 2025

The Use of Trace Eyeblink Classical Conditioning to Assess Hippocampal Dysfunction in a Rat Model of Fetal Alcohol Spectrum Disorders
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Retrospective memory trace sustained by the human hippocampus during working memory task.

Xinyi Zhang1,2,3, Yuji Naya1,3,4,5

  • 1School of Psychological and Cognitive Sciences, Peking University, Beijing, China.

The European Journal of Neuroscience
|November 29, 2021
PubMed
Summary
This summary is machine-generated.

The hippocampus (HPC) may support short-term memory by retaining recent information, unlike the prefrontal cortex (PFC) which integrates multiple working memory items.

Keywords:
declarative memoryepisodic memoryhippocampusrepresentational similarity analysisshort-term memoryworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Working memory, crucial for action preparation, is theorized to involve the prefrontal cortex (PFC) for executive control.
  • The hippocampus (HPC) is traditionally linked to long-term episodic memory but recent findings suggest roles in perception and short-term storage.

Purpose of the Study:

  • To investigate whether the hippocampus (HPC) actively supports working memory maintenance.
  • To differentiate the roles of the HPC and PFC in processing sequential information for short-term memory.

Main Methods:

  • A novel delayed matching-to-sample task with sequential visual stimuli was employed.
  • Representational Similarity Analysis (RSA) of blood-oxygen-level-dependent (BOLD) signals in human participants was used.
  • The task design dissociated working memory contents from single-item perceptual information.

Main Results:

  • Representational Similarity Analysis (RSA) revealed the right hippocampus (HPC) represented only the second sample's identity and location.
  • The right prefrontal cortex (PFC) represented conjunctional information for both sequentially presented samples.
  • These findings were derived from analyzing neural activity during the delay period following sample presentations.

Conclusions:

  • The hippocampus (HPC) appears to support short-term memory through retrospective coding of the most recent event.
  • The prefrontal cortex (PFC) is implicated in prospective coding for working memory, integrating information from multiple events.
  • This study clarifies the distinct contributions of the HPC and PFC in short-term memory processes.