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Related Concept Videos

Long-term Potentiation01:25

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.
Hebbian LTP
LTP can occur when...
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Long-term Potentiation01:35

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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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Integration of Synaptic Events01:28

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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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Related Experiment Video

Updated: Nov 29, 2025

3D Modeling of Dendritic Spines with Synaptic Plasticity
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Dendritic Voltage Recordings Explain Paradoxical Synaptic Plasticity: A Modeling Study.

Claire Meissner-Bernard1, Matthias Chinyen Tsai2, Laureline Logiaco3

  • 1Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland.

Frontiers in Synaptic Neuroscience
|November 23, 2020
PubMed
Summary
This summary is machine-generated.

Synaptic plasticity, including long-term potentiation and depression, depends on synapse location and stimulation timing. A new model shows postsynaptic voltage predicts plasticity outcomes, explaining paradoxical experimental results.

Keywords:
STDPcomputational neurosciencedendritic recordingsmodelsynaptic plasticityvoltage

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Synaptic Plasticity

Background:

  • Synaptic plasticity, crucial for learning and memory, exhibits complex behavior where identical stimulation can cause potentiation or depression.
  • These paradoxical outcomes are observed depending on the synapse's location on the neuron (proximal vs. distal) and stimulation parameters.

Purpose of the Study:

  • To develop and validate a phenomenological model of Hebbian plasticity.
  • To explain the location- and timing-dependent paradoxical outcomes in synaptic plasticity experiments.

Main Methods:

  • A phenomenological model of Hebbian plasticity was developed, focusing on the interaction between glutamate traces and postsynaptic voltage.
  • The model was tested using experimentally recorded dendritic voltage traces from hippocampus and neocortex, avoiding direct voltage simulation.

Main Results:

  • The time course of the postsynaptic voltage near a stimulated synapse reliably predicts whether it will undergo potentiation, depression, or no change.
  • The computational model successfully explains how dendritic location and stimulation frequency/timing influence plasticity outcomes.

Conclusions:

  • Postsynaptic voltage dynamics are a key determinant of synaptic plasticity outcomes.
  • The developed model provides a unified explanation for diverse and seemingly contradictory findings in synaptic plasticity research.