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Related Concept Videos

Plasticity00:58

Plasticity

Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their original...
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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Inducing Plasticity of Astrocytic Receptors by Manipulation of Neuronal Firing Rates
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Published on: March 20, 2014

Structural plasticity can produce metaplasticity.

Georgios Kalantzis1, Harel Z Shouval

  • 1Department of Neurobiology and Anatomy, The University of Texas Medical School at Houston, Houston, Texas, United States of America. kalantzi@bcm.edu

Plos One
|December 4, 2009
PubMed
Summary
This summary is machine-generated.

Structural changes in synaptic spines can cause synapse-specific metaplasticity by altering calcium dynamics. This study shows how spine geometry and NMDA receptor function influence synaptic plasticity rules.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Synaptic Plasticity

Background:

  • Synaptic plasticity is crucial for learning, memory, and development.
  • Metaplasticity describes how prior synaptic activity alters future plasticity.
  • Structural changes in synaptic spines are linked to plasticity and may influence metaplasticity.

Purpose of the Study:

  • To investigate the extent to which structural plasticity of spines can cause metaplasticity.
  • To explore how spine geometry and N-methyl-D-aspartic acid (NMDA) receptor conductance impact synaptic plasticity.
  • To understand the conditions under which structural plasticity forms the basis of synapse-specific metaplasticity.

Main Methods:

  • Utilized a simplified model of a synaptic spine.
  • Incorporated a calcium-dependent plasticity rule.
  • Simulated calcium dynamics within spines.

Main Results:

  • Demonstrated that spine geometry alterations shift plasticity thresholds, creating refractory periods and promoting depotentiation.
  • Showed that changes in NMDA receptor response can enable further synaptic weight alterations.
  • Found that NMDA response enhancement proportional to postsynaptic density area can restore plasticity curves to their initial state.

Conclusions:

  • Structural plasticity of synaptic spines can be a direct cause of synapse-specific metaplasticity.
  • Calcium dynamics within spines are critically influenced by structural changes, thereby modulating plasticity.
  • The findings provide a biophysical basis for understanding metaplasticity at individual synapses.