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

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 Depression01:03

Long-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...
Long-term Depression01:05

Long-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.

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Related Experiment Video

Updated: May 17, 2026

Ex Vivo Optogenetic Interrogation of Long-Range Synaptic Transmission and Plasticity from Medial Prefrontal Cortex to Lateral Entorhinal Cortex
11:31

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Published on: February 25, 2022

Dark exposure extends the integration window for spike-timing-dependent plasticity.

Yatu Guo1, Shiyong Huang, Roberto de Pasquale

  • 1The Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland 21218, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 27, 2012
PubMed
Summary

Metaplasticity in the visual cortex adapts to neural activity. Dark rearing alters spike-timing-dependent plasticity, widening the window for long-term depression induction via increased NR2b-containing NMDARs.

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Visual Cortex Research

Background:

  • Metaplasticity describes adaptive changes in synaptic plasticity, like long-term potentiation (LTP) and long-term depression (LTD), influenced by neural activity.
  • In the visual cortex, dark rearing is known to shift the frequency thresholds for inducing LTP and LTD.

Purpose of the Study:

  • To investigate metaplasticity in spike-timing-dependent plasticity (STDP) within the mouse visual cortex.
  • To understand how neural activity deprivation affects the induction rules of timing-dependent LTD.

Main Methods:

  • Utilized a mouse visual cortex model to study metaplasticity.
  • Examined the effects of dark rearing on spike-timing-dependent plasticity.
  • Investigated the role of NR2b-containing NMDARs in observed plasticity changes.

Main Results:

  • Dark rearing, which restricts rate-dependent LTD induction, paradoxically extends the integration window for timing-dependent LTD.
  • This extended window allows for LTD induction even with random presynaptic and postsynaptic firing.
  • Increased NR2b-containing NMDARs at the synapse appear to underlie these changes in both rate- and time-dependent LTD.

Conclusions:

  • Metaplasticity rules can manifest in opposing ways depending on the plasticity induction paradigm used.
  • The study highlights the dynamic and context-dependent nature of synaptic plasticity in the visual cortex.
  • NR2b-containing NMDARs play a crucial role in mediating these adaptive synaptic changes.