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関連する概念動画

Long-term Potentiation01:35

Long-term Potentiation

59.7K
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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Long-term Potentiation01:25

Long-term Potentiation

3.9K
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.
Hebbian LTP
LTP can occur when...
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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.
Calcium Ion Concentration Mechanism
If over...
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Long-term Depression01:05

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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Chemical Synapses01:26

Chemical Synapses

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
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Chemical Synapses01:26

Chemical Synapses

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
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3D Modeling of Dendritic Spines with Synaptic Plasticity
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枝別特異的なデンドリット型Ca2+) 尖端は,持続的なシナプス性可塑性を引き起こします.

Joseph Cichon1, Wen-Biao Gan1

  • 1Skirball Institute, Department of Neuroscience and Physiology, New York University School of Medicine, New York, New York 10016, USA.

Nature
|March 31, 2015
PubMed
まとめ
この要約は機械生成です。

脳は,運動学習中に特定の神経細胞の枝にカルシウム (Ca2+) スパイクを生成することによって,記憶を保存します. この部門特有の活動は,古い記憶を干渉することなく,新しい学習を保存します.

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Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices
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関連する実験動画

Last Updated: Apr 15, 2026

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Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices
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Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
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科学分野:

  • 神経科学は神経科学である.
  • 細胞生物学 細胞生物学
  • システム神経科学 システム神経科学

背景:

  • 脳の記憶容量は広大ですが,新しい記憶の形成を阻止し,既存の記憶を破壊するメカニズムは不明です.
  • 脳が特定の記憶をどのように記憶するかを理解することは,認知神経科学にとって極めて重要です.

研究 の 目的:

  • 運動学習と記憶記憶におけるデンドリットカルシウムスパイクの役割を調査する.
  • 分別された学習された記憶の分離が支部固有のニューロンの活動に根付いているかどうかを判断する.

主な方法:

  • 運動学習のタスク中にマウスのモーター皮質層Vのピラミッドニューロンにおける dendritic Ca(2+) スパイクの電気生理学的記録.
  • ソマトスタチンを発現する内ニューロンの無活性化により,Ca2+) スパイクパターンの影響を観察する.
  • ポストシナプス dendritic 脊椎の強化とdepotentiationを介してシナプス可塑性の評価.
  • 異なる運動タスクを学習した後の行動パフォーマンスの評価.

主要な成果:

  • 異なる運動学習のタスクにより,ピラミッド神経細胞の異なるアピカルタフトの枝にCa2+) スパイクが誘発される.
  • タスクに関連した,枝固有のCa2+) スパイクは,活発なデンドリート脊椎の長期的な増強につながった.
  • インターニューロンの無活性化により,異なるタスクのために同じ枝にCa2+) スパイクが発生し,脊髄の弱体化と学習障害を引き起こしました.
  • 学習とパフォーマンスの障害は,同じデンドリット分岐にCa(2+) スパイクが重なり合うときに観察されました.

結論:

  • dendritic-branch-specific Ca(2+) スパイクは,長期にわたるシナプス可塑性を確立するために不可欠です.
  • このメカニズムは,異なる学習経験に関連した情報の保存を容易にし,メモリ干渉を防止します.
  • ニューロンのネットワーク活動と内部ニューロンの機能は,異なる記憶の分離と保存において重要な役割を果たします.