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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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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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Hippocampus alters visual representation to encode new memory.

Chenhui Liu1, Zhen Liu1, Kaiyuan Liu2

  • 1School of Life Science and Technology & State Key Laboratory of Advanced Medical Materials and Devices, ShanghaiTech University, Shanghai 201210, China.

Cell Reports
|April 17, 2025
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Researchers identified a visual cortex neuronal ensemble crucial for memory association, dependent on the hippocampus. Hippocampal activation aids this ensemble, revealing early memory network organization.

Keywords:
CP: Neuroscienceassociation learningengramhippocampusmemoryvisual cortex

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Area of Science:

  • Neuroscience
  • Memory Research
  • Systems Neuroscience

Background:

  • Hippocampal-cortical interactions are vital for forming and storing episodic memories.
  • The precise timing and mechanisms of these interactions during memory encoding are not fully understood.

Purpose of the Study:

  • To investigate the role of the visual cortex (VIS) in associative learning and memory formation.
  • To elucidate the hippocampal contribution to the emergence of memory representations in the cortex.

Main Methods:

  • Utilized a trace eyeblink conditioning paradigm in mice.
  • Employed optogenetics to manipulate hippocampal activity.
  • Investigated neuronal ensembles in mouse visual cortex (VIS) using calcium imaging and electrophysiology.
  • Examined the role of fos+ engram cells and VIP+ neurons in memory encoding.

Main Results:

  • Identified a neuronal ensemble in VIS layer II that responds to paired conditioned stimulus (CS) and unconditioned stimulus (US), but not discrete stimuli.
  • This VIS representation of the association is hippocampus-dependent and contributes to memory encoding.
  • Optogenetic hippocampal activation facilitated the emergence of this associative representation in VIS.
  • Found that fos+ engram cells, modulated by VIP+ neurons, act as hubs within this ensemble.

Conclusions:

  • The hippocampus modulates memory ensembles in the visual cortex during early learning stages.
  • Emerging memory ensembles in VIS, influenced by the hippocampus, are critical for encoding new associations.
  • This highlights the structural organization of memory networks for new memory formation.