Related Experiment Video
Updated: May 24, 2026
07:13
3D Modeling of Dendritic Spines with Synaptic Plasticity
Published on: May 18, 2020
Calcium-based plasticity model explains sensitivity of synaptic changes to spike pattern, rate, and dendritic
Michael Graupner1, Nicolas Brunel
1Laboratory of Neurophysics and Physiology, Unité Mixte de Recherche 8119, CNRS and Université Paris Descartes, 75270 Paris Cedex 06, France. michael.graupner@nyu.edu
Summary
This study introduces a calcium-based model explaining how synaptic plasticity outcomes depend on postsynaptic calcium dynamics. The model quantitatively predicts diverse experimental results and clarifies variability across studies.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Synaptic Plasticity
Background:
- Synaptic efficacy changes via long-term potentiation (LTP) and depression (LTD).
- Postsynaptic calcium concentration increases are critical for many plasticity induction protocols.
- The precise role of calcium dynamics in determining plasticity outcomes remains unclear.
Purpose of the Study:
- To develop and validate a calcium-based model of synaptic plasticity.
- To investigate how postsynaptic calcium dynamics influence synaptic potentiation and depression.
- To explain the diversity of spike-timing-dependent plasticity (STDP) curves observed experimentally.
Main Methods:
- Development of a computational model of a synapse.
- The model incorporates calcium thresholds for potentiation and depression.
- Analysis of model predictions for various stimulation protocols.
Main Results:
- The calcium-based model generates diverse STDP curves matching experimental observations.
- The model quantitatively explains plasticity outcomes across different spike timing and firing rate patterns.
- Model parameters predict variability in plasticity outcomes observed in different studies.
Conclusions:
- Postsynaptic calcium dynamics, not just concentration, are key determinants of synaptic plasticity.
- The model offers a mechanistic understanding of how stimulation protocols induce LTP and LTD.
- This biophysically realistic yet tractable model is suitable for studying plasticity at multiple biological levels.
Related Concept Videos
01:25Long-term Potentiation
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 presynaptic neurons...
Hebbian LTP
LTP can occur when presynaptic neurons...
01:35Long-term Potentiation
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.
01:01Neuroplasticity
Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
01:03Long-term Depression
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 time, all...
Calcium Ion Concentration Mechanism
If over time, all...
01:05Long-term Depression
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.
01:19The Role of Ion Channels in Neuronal Computation
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.