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Synaptic Signaling01:12

Synaptic Signaling

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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
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Synaptic Signaling01:09

Synaptic Signaling

6.7K
Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
6.7K
System of Memory01:23

System of Memory

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Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
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Working Memory01:24

Working Memory

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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 Memory01:18

Long-Term Memory

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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.
Long-term memory can be categorized into two primary types: explicit and implicit memory. Explicit memory, also known as declarative memory, involves the conscious recollection of information that we deliberately try to remember, recall, and articulate. This type of memory encompasses specific facts, events, and...
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Traumatic Memory01:20

Traumatic 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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A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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エングラム細胞間の領域間シナプスマップが記憶形成の基礎となる

Jun-Hyeok Choi1, Su-Eon Sim1, Ji-Il Kim1

  • 1School of Biological Sciences, Seoul National University, Gwanak-gu, Seoul 08826, South Korea.

Science (New York, N.Y.)
|April 28, 2018
PubMed
まとめ

科学者達は 脳の細胞の間の 強い繋がり 特にエングラム細胞が 記憶を物理的に 保存することを発見しました 脳のCA1とCA3領域の 接続性の向上は 記憶の強さと形成に直接関係しています

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関連する実験動画

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A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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科学分野:

  • 神経科学
  • 細胞生物学
  • 記憶に関する研究

背景:

  • 記憶貯蔵は,エングラム細胞内のシナプス可塑性を含むと理論化されています.
  • これらの細胞内のメモリエンコーディングの正確な物理的な位置は,主に理論的なままです.

研究 の 目的:

  • 記憶を保存するための特定のニューロンの基質を特定するために
  • 記憶形成の過程で シナプス細胞の変化を調査する

主な方法:

  • デュアルeGRASP (シナプスパートナー間の緑色光タンパク質再構成) 技術の開発.
  • CA3とCA1のエングラム細胞間のシナプスの検査
  • 文脈的な恐怖条件付けと長期的強化 (LTP) の評価

主要な成果:

  • CA1エングラム細胞からCA3エングラム細胞からの入力を受け, dendritic spinesの増加が観察されました.
  • エングラム細胞間の接続性の強化は 背景恐怖条件付けの記憶力と相関しています
  • CA3からCA1のエングラム予測は,長期の増強を大幅に遮断した.

結論:

  • エングラム細胞間の構造的・機能的接続性が強化されることが 記憶形成のシナプス相関である.
  • CA1エングラム細胞から入力を受け取るCA3エングラム細胞の特定のシナプス変化は,記憶のエンコーディングに不可欠です.