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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
LTP can occur when...
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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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Acute Mouse Brain Slicing to Investigate Spontaneous Hippocampal Network Activity
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Locally sequential synaptic reactivation during hippocampal ripples.

Tomoe Ishikawa1, Yuji Ikegaya1,2

  • 1Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan.

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|February 26, 2020
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Summary

Neurons process memory through sequential activity during sharp-wave (SW) ripples. This study reveals how downstream neurons decode this complex neural communication along dendrites.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Cognitive Science

Background:

  • Neuronal ensembles in the hippocampus show sequential reactivation during sharp-wave (SW) ripples, crucial for memory.
  • The mechanism by which downstream neurons decode this spatiotemporally organized activity is not well understood.

Purpose of the Study:

  • To investigate how CA1 pyramidal neurons decode sequential neuronal ensemble activity during SW ripples.
  • To explore the spatiotemporal patterns of spine activation along dendrites in response to SW ripples.

Main Methods:

  • Utilized subcellular calcium imaging in ex vivo hippocampal networks.
  • Focused on CA1 pyramidal neurons to observe dendritic activity.

Main Results:

  • Discovered serial activation of neighboring dendritic spines in CA1 pyramidal neurons.
  • Observed that sequential spine activity occurred repeatedly and complexly across different SW events.
  • Found that within a single SW event, multiple discrete sequences appeared across dendritic trees, with preferential activity in certain dendritic branches.

Conclusions:

  • Sequential replays of multineuronal spikes during SW ripples are distributed across compartmentalized dendritic foci of postsynaptic neurons.
  • The spatiotemporal features of these sequential replays are preserved during dendritic integration.