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Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

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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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Repressed Memory01:16

Repressed Memory

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Repressed memories are a psychological phenomenon where memories of traumatic events are unconsciously blocked from a person's awareness. This process occurs as a defense mechanism, protecting the mind from the emotional impact of distressing or painful experiences. For example, a person who has experienced childhood trauma may grow up with no conscious recollection of the event. In such cases, the memories are thought to be buried deep within the subconscious, inaccessible to the conscious...
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Long-term Depression01:03

Long-term Depression

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Higher Mental Functions of Brain: Learning and Memory01:26

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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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The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
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Updated: Apr 1, 2026

A Prediction Error-driven Retrieval Procedure for Destabilizing and Rewriting Maladaptive Reward Memories in Hazardous Drinkers
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記憶形成中の海馬における複数の抑制メカニズム

Jun Cho1, Nam-Kyung Yu2, Jun-Hyeok Choi2

  • 1Center for RNA Research, Institute for Basic Science, Seoul 151-742, Korea. Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul 151-747, Korea.

Science (New York, N.Y.)
|October 3, 2015
PubMed
まとめ

遺伝子の抑制は 記憶形成に不可欠です この研究では,学習後の記憶安定に影響を与えるエストロゲン受容体1 (ESR1/ERα) のシグナル伝達を含む,ヒポカンプスの新種の遺伝子サイレンスメカニズムが明らかになりました.

さらに関連する動画

Improved Preparation and Preservation of Hippocampal Mouse Slices for a Very Stable and Reproducible Recording of Long-term Potentiation
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Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
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Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording

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関連する実験動画

Last Updated: Apr 1, 2026

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08:05

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Improved Preparation and Preservation of Hippocampal Mouse Slices for a Very Stable and Reproducible Recording of Long-term Potentiation
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Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
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Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording

Published on: August 11, 2019

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科学分野:

  • 神経科学
  • 分子生物学
  • ゲノミクス

背景:

  • 記憶の安定化には 遺伝子調節を含む複雑な分子プロセスが 含まれています
  • 学習後のゲノムスケールでのこれらの変化の時間的動態は ほとんど未知のままです

研究 の 目的:

  • ネズミのヒポカンプスにおける ゲノムスケールの時間的分子変化,特にトランスレーションおよびトランスクリプションの規則を,文脈的な恐怖条件付けで調査する.
  • 記憶形成に不可欠な新しい遺伝子抑制メカニズムを特定する.

主な方法:

  • リボソームプロファイリングとRNAシーケンスを使用して,トランスレーション状態とトランスクリプトレベルを定量化しました.
  • 特定の遺伝子操作が記憶に与える影響を評価するために,行動分析が行われました.

主要な成果:

  • 遺伝子抑制の3つの異なるタイプが特定されました:リボソームタンパク質遺伝子の翻訳抑制,特定の遺伝子の早期学習誘発翻訳抑制,およびエストロゲン受容体1 (ESR1/ERα) 信号による遅い持続抑制です.
  • Nrsn1の過剰発現やESR1/ERαの活性化により 記憶の形成が妨げられます

結論:

  • 遺伝子の抑制は 記憶の形成と安定化において 重要な役割を担っています
  • この研究は,海馬の記憶プロセスにおける翻訳制御とESR1/ERαシグナルの重要性を強調しています.