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Related Concept Videos

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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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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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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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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...
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Avoidance learning and learned helplessness are critical concepts in understanding behavioral responses to negative stimuli.
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3D Modeling of Dendritic Spines with Synaptic Plasticity
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Learning-Related Plasticity in Dendrite-Targeting Layer 1 Interneurons.

Elisabeth Abs1, Rogier B Poorthuis1, Daniella Apelblat2

  • 1Max Planck Institute for Brain Research, 60438 Frankfurt, Germany.

Neuron
|October 2, 2018
PubMed
Summary

Neocortical layer 1 interneurons (INs) mediate experience-dependent inhibition in pyramidal neuron dendrites, strengthening memory traces. This highlights a novel mechanism for encoding salient stimuli in the brain.

Keywords:
GABAergic interneuronsNDNF interneuronsconnectivitydendritic inhibitionfear learninggenetic markersinterneuronslayer 1neocortical circuitssomatostatin interneuronstop-down processing

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Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Systems Neuroscience

Background:

  • Neocortical sensory processing mechanisms are well-studied, yet regulation by behavioral relevance remains unclear.
  • Neocortical layer 1 (L1) is crucial for processing top-down information and modulating neural activity.
  • Interneurons (INs) play vital roles in regulating cortical circuits, but their specific functions in L1 require further elucidation.

Purpose of the Study:

  • To investigate the role of L1 interneurons, specifically those expressing Neuron-Derived Neurotrophic Factor (NDNF), in sensory processing and memory.
  • To understand how experience-dependent plasticity in L1 contributes to the encoding of behaviorally relevant stimuli.
  • To define the mechanisms by which L1 inhibition influences pyramidal neuron activity and memory formation.

Main Methods:

  • Utilized Neuron-Derived Neurotrophic Factor (NDNF) as a specific marker for L1 interneurons (INs).
  • Employed in vivo 2-photon calcium imaging and electrophysiology to record neural activity.
  • Applied viral tracing and optogenetics for circuit manipulation and associative memory tasks to assess behavioral relevance.

Main Results:

  • L1 NDNF-INs mediate a prolonged inhibition in distal pyramidal neuron dendrites, which correlates with memory trace strength.
  • Inhibition from Martinotti cells remains constant post-conditioning but regulates sensory responses in NDNF-INs.
  • Experience-dependent plasticity in L1 inhibition contributes to encoding salient stimuli through elevated distal dendritic inhibition.

Conclusions:

  • Identified a genetically defined form of dendritic inhibition in L1 that is highly dependent on experience.
  • Demonstrated that salient stimuli are encoded not only by disinhibition but also by increased distal dendritic inhibition.
  • Established a novel circuit mechanism where L1 NDNF-INs dynamically regulate cortical processing based on behavioral relevance and memory.