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Related Concept Videos

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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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.
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Engineering a memory with LTD and LTP.

Sadegh Nabavi1, Rocky Fox1, Christophe D Proulx2

  • 11] Center for Neural Circuits and Behavior, Department of Neuroscience and Section of Neurobiology, University of California at San Diego, California 92093, USA [2].

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|June 5, 2014
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Summary
This summary is machine-generated.

Scientists demonstrate that long-term depression (LTD) can inactivate fear memories, while long-term potentiation (LTP) can reactivate them. This research provides causal evidence linking synaptic plasticity to memory.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Memory Research

Background:

  • Memory encoding is hypothesized to involve synaptic plasticity, specifically long-term potentiation (LTP) and long-term depression (LTD).
  • Establishing a direct causal relationship between these synaptic mechanisms and memory has remained a significant challenge in neuroscience.

Purpose of the Study:

  • To investigate the causal role of LTP and LTD in the inactivation and reactivation of associative fear memory.
  • To demonstrate the direct manipulation of memory recall through targeted synaptic modifications.

Main Methods:

  • Utilized optogenetics to stimulate auditory inputs targeting the amygdala in an animal model.
  • Applied LTD conditioning to inactivate fear memory associated with a foot shock.
  • Applied LTP conditioning to reactivate the inactivated fear memory.

Main Results:

  • Optogenetically induced LTD successfully inactivated the conditioned fear memory.
  • Subsequent optogenetically induced LTP reactivated the previously inactivated fear memory.
  • Demonstrated the precise control over memory states (inactivation/reactivation) through synaptic plasticity manipulation.

Conclusions:

  • Provides strong causal evidence linking long-term depression (LTD) and long-term potentiation (LTP) to the mechanisms of memory inactivation and reactivation.
  • Supports the hypothesis that synaptic plasticity is a fundamental cellular basis for memory formation and recall.
  • Highlights the potential for targeted synaptic modulation in understanding and potentially treating memory-related disorders.