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Related Concept Videos

Integration of Synaptic Events01:28

Integration of Synaptic Events

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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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Long-term Depression01:03

Long-term Depression

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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.
Calcium Ion Concentration Mechanism
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Long-term Depression01:05

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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 Potentiation01:25

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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

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.
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Neuroplasticity01:01

Neuroplasticity

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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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Related Experiment Video

Updated: Apr 6, 2026

Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
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Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording

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Functional synaptic connectivity shapes spine stability in the hippocampus.

Cynthia Rais1, J Simon Wiegert2,3

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Functional synaptic connections in the brain are linked to physical spine structure. Larger, more stable spines support stronger synaptic responses, ensuring consistent information flow in neural circuits.

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Author Spotlight: Optimizing Dendritic Spine Analysis for Balanced Manual and Automated Assessment in the Hippocampus CA1 Apical Dendrites
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Related Experiment Videos

Last Updated: Apr 6, 2026

Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
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Author Spotlight: Optimizing Dendritic Spine Analysis for Balanced Manual and Automated Assessment in the Hippocampus CA1 Apical Dendrites
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Author Spotlight: Optimizing Dendritic Spine Analysis for Balanced Manual and Automated Assessment in the Hippocampus CA1 Apical Dendrites

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Systems Neuroscience

Background:

  • Synaptic plasticity, including changes in synaptic weight and synapse dynamics, is crucial for learning and memory.
  • The link between the functional strength and structural dynamics of individual glutamatergic synapses in vivo is not well understood.
  • The relationship between spine morphology, stability, and functional adaptation requires further investigation.

Purpose of the Study:

  • To investigate the relationship between functional strength and structural dynamics of individual glutamatergic synapses in the living mammalian brain.
  • To determine how spine morphology and stability relate to functional adaptations in neural circuits.
  • To explore the long-term stability of synaptic inputs at both the individual synapse and dendritic branch levels.

Main Methods:

  • Repeated in vivo two-photon calcium imaging of excitatory postsynaptic calcium transients.
  • Optogenetic stimulation of presynaptic CA3 cells targeting CA1 neurons in awake, head-fixed mice.
  • Longitudinal recordings over a 2-week period to track structural and functional changes.

Main Results:

  • Functional connectivity was found to predict the structural stability and spatial proximity of synaptic inputs.
  • Spines with larger functional responses exhibited greater volume and higher stability compared to unresponsive spines.
  • Individual synaptic responses showed high variability over time, whereas dendritic branches maintained stable input.

Conclusions:

  • Synaptic function is closely related to the physical structure and stability of dendritic spines.
  • Dendritic branches maintain stable information processing despite significant fluctuations at individual synapses.
  • These findings provide insights into the structural basis of learning and memory mechanisms.