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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
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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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Related Experiment Video

Updated: May 3, 2026

Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
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Synaptic mechanisms underlying thalamic activation-induced plasticity in the rat auditory cortex.

Zhi-ru Zhu1, Fenglian Xu, Wei-gang Ji

  • 1Department of Physiology, Third Military Medical University, Chongqing, People's Republic of China;

Journal of Neurophysiology
|February 7, 2014
PubMed
Summary

Electrical stimulation of the auditory thalamus induces frequency-specific plasticity in the auditory cortex. This involves N-methyl-d-aspartate and other receptors, crucial for auditory learning and adaptation.

Keywords:
plasticityrat auditory cortexthalamocortical system

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Synaptic Plasticity

Background:

  • Electrical stimulation of the ventral division of the medial geniculate body (MGBv) causes frequency-specific plasticity in auditory cortical (AC) neurons.
  • This plasticity involves shifts in best frequency (BF), but the underlying synaptic mechanisms remain unclear.

Purpose of the Study:

  • To investigate the synaptic mechanisms of MGBv stimulation-induced frequency-specific auditory plasticity.
  • To test the hypothesis that thalamocortical synaptic transmission and receptor function mediate this plasticity and BF shifts.

Main Methods:

  • Whole-cell recordings were used to measure excitatory postsynaptic currents in auditory cortex layer III/IV pyramidal neurons.
  • High-frequency stimulation (HFS) of the MGBv was applied in an auditory thalamocortical slice preparation.
  • Pharmacological studies employed specific antagonists to block N-methyl-d-aspartate, γ-aminobutyric acid, and type 5 metabotropic glutamate receptors.

Main Results:

  • HFS of the MGBv induced long-term bidirectional synaptic plasticity, including long-term potentiation and depression, in AC neurons.
  • Pharmacological blockade of NMDA, GABA, and mGluR5 receptors significantly inhibited MGBv stimulation-induced long-term plasticity.
  • Receptor antagonists also significantly inhibited the observed shift in BF.

Conclusions:

  • Specific N-methyl-d-aspartate, γ-aminobutyric acid, and type 5 metabotropic glutamate receptors play a critical role in mediating MGBv stimulation-induced frequency-specific auditory cortical plasticity.
  • These receptors are essential for the synaptic mechanisms underlying BF shifts in the auditory cortex.