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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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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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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Related Experiment Video

Updated: Feb 2, 2026

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex

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A New Look at Visual System Plasticity.

Marcello Maniglia1, Aaron R Seitz1

  • 1Department of Psychology, University of California, Riverside, Riverside CA, USA.

Trends in Cognitive Sciences
|November 28, 2018
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Summary
This summary is machine-generated.

Associative learning tunes cortical processing via reward-based mechanisms. However, this study demonstrates that such learning does not alter the retinotopic map in the studied sensory cortex.

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Area of Science:

  • Neuroscience
  • Cortical plasticity
  • Learning and memory

Background:

  • Reward-based learning is a known driver of cortical plasticity in sensory areas.
  • Previous research indicates significant alterations in cortical processing following associative learning.

Purpose of the Study:

  • To investigate the effects of associative learning on cortical processing at both single-unit and population levels.
  • To determine if associative learning modifies the retinotopic map in the studied sensory cortex.

Main Methods:

  • A dual-scale approach was employed, analyzing single-unit activity and population-level dynamics.
  • Experiments were conducted on mice to study associative learning paradigms.

Main Results:

  • Associative learning was shown to effectively tune cortical processing.
  • Crucially, the retinotopic map remained unmodified, distinguishing this finding from other sensory cortices.

Conclusions:

  • Associative learning modulates cortical processing without altering the underlying spatial organization (retinotopy).
  • This suggests distinct mechanisms of plasticity in different cortical areas or under different learning conditions.