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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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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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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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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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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: Jun 10, 2025

Improved Preparation and Preservation of Hippocampal Mouse Slices for a Very Stable and Reproducible Recording of Long-term Potentiation
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Persistent activity during working memory maintenance predicts long-term memory formation in the human hippocampus.

Jonathan Daume1, Jan Kamiński2, Yousef Salimpour3

  • 1Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA; Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA; Center for Neural Science and Medicine, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA.

Neuron
|October 15, 2024
PubMed
Summary

This study reveals that persistent activity in the human hippocampus supports both working memory (WM) maintenance and long-term memory (LTM) encoding. This finding suggests a shared neural basis for these distinct memory systems.

Keywords:
amygdalacategory-selective neuronsconfidence ratingsdeclarative memoryhippocampushuman single-neuron recordingslong-term memorymemory-selective neuronspersistent activityworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Memory Research

Background:

  • Working memory (WM) and long-term memory (LTM) are traditionally considered separate cognitive systems.
  • The interaction between WM and LTM during memory formation is not well understood.

Purpose of the Study:

  • To investigate the neural mechanisms underlying the interaction between WM and LTM.
  • To determine if single neurons in the medial temporal lobe contribute to both WM maintenance and LTM encoding.

Main Methods:

  • Single-neuron recordings were conducted in the human medial temporal lobe (hippocampus and amygdala).
  • Participants maintained novel items in WM and underwent a recognition memory test for these items.
  • Analysis focused on persistent activity during WM maintenance and visually evoked activity during memory retrieval.

Main Results:

  • Hippocampal persistent activity during WM maintenance predicted subsequent LTM recognition accuracy.
  • Visually evoked activity in the same cells did not predict LTM formation.
  • Memory-selective neurons showed stronger responses to familiar stimuli with high prior WM persistent activity during LTM retrieval.

Conclusions:

  • Hippocampal persistent activity serves a dual role in supporting both WM maintenance and LTM encoding.
  • This suggests a common single-neuron mechanism shared by WM and LTM systems.
  • The findings challenge the strict separation of WM and LTM at the neural level.