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Related Concept Videos

Long-term Potentiation01:35

Long-term Potentiation

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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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Long-term Potentiation01:25

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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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Long-term Depression01:03

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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
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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.
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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.
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Related Experiment Video

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3D Modeling of Dendritic Spines with Synaptic Plasticity
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Branch-specific dendritic Ca(2+) spikes cause persistent synaptic plasticity.

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
Summary
This summary is machine-generated.

The brain stores memories by generating calcium (Ca2+) spikes on specific neuron branches during motor learning. This branch-specific activity preserves new learning without interfering with old memories.

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Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Systems Neuroscience

Background:

  • The brain's memory capacity is vast, yet the mechanisms preventing new memory formation from disrupting existing ones are unclear.
  • Understanding how the brain stores distinct memories is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate the role of dendritic calcium spikes in motor learning and memory storage.
  • To determine if branch-specific neuronal activity underlies the separation of distinct learned memories.

Main Methods:

  • Electrophysiological recordings of dendritic Ca(2+) spikes in mouse motor cortex layer V pyramidal neurons during motor learning tasks.
  • Inactivation of somatostatin-expressing interneurons to observe effects on Ca(2+) spike patterns.
  • Assessment of synaptic plasticity via postsynaptic dendritic spine potentiation and depotentiation.
  • Evaluation of behavioral performance after learning distinct motor tasks.

Main Results:

  • Different motor learning tasks induced Ca(2+) spikes on distinct apical tuft branches of pyramidal neurons.
  • Task-related, branch-specific Ca(2+) spikes led to long-lasting potentiation of active dendritic spines.
  • Inactivating interneurons caused Ca(2+) spikes to occur on the same branches for different tasks, leading to spine depotentiation and impaired learning.
  • Disruption of learning and performance was observed when Ca(2+) spikes overlapped on the same dendritic branches.

Conclusions:

  • Dendritic-branch-specific Ca(2+) spikes are essential for establishing long-lasting synaptic plasticity.
  • This mechanism facilitates the storage of information associated with different learning experiences, preventing memory interference.
  • Neuronal network activity and interneuron function play critical roles in segregating and storing distinct memories.