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Related Concept Videos

Integration of Synaptic Events01:28

Integration of Synaptic Events

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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Long-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.
Long-term Potentiation01:25

Long-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.
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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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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.
Neuroplasticity01:01

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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.

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3D Modeling of Dendritic Spines with Synaptic Plasticity
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Spike-timing-dependent synaptic plasticity and synaptic democracy in dendrites.

Albert Gidon1, Idan Segev

  • 1Department of Neurobiology, The Hebrew University, Edmond J. Safra Campus, Givat Ram Jerusalem 91904, Israel. agidon20@lobster.ls.huji.ac.il

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Summary

Proximal synapses dominate distal ones during spike-timing-dependent plasticity (STDP) in computational models. Strategies like modified STDP rules or distance-dependent synaptic conductance can balance synapse efficacy.

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Area of Science:

  • Computational neuroscience
  • Synaptic plasticity
  • Dendritic integration

Background:

  • Dendrites play a crucial role in integrating synaptic inputs.
  • Spike-timing-dependent plasticity (STDP) modifies synaptic strength based on spike timing.
  • The impact of dendritic structure on STDP efficacy is not fully understood.

Purpose of the Study:

  • To computationally investigate how dendritic morphology affects excitatory synapse efficacy under STDP.
  • To identify mechanisms that could balance the influence of proximal and distal synapses.

Main Methods:

  • Simulations using cylindrical dendritic models and reconstructed dendritic trees.
  • Modeling linear STDP and modified STDP rules.
  • Analyzing synaptic efficacy as a function of location and synaptic conductance.

Main Results:

  • Distal synapses diminish in efficacy following linear STDP, leading to proximal synapse dominance.
  • Proximal synapse dominance is independent of initial synaptic strength distribution.
  • Increased dendritic cable length exacerbates the dominance of proximal synapses.
  • A multiplicative STDP component and distance-dependent g(max) partially restored distal synapse efficacy.

Conclusions:

  • Linear STDP leads to a bias favoring proximal synapses, regardless of initial strength.
  • Dendritic structure and STDP rules interact to determine synaptic efficacy.
  • Modified STDP rules or adaptive synaptic conductance bounds may be biological mechanisms for balancing synapse influence.