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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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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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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Plasticity during Early Brain Development Is Determined by Ontogenetic Potential.

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The young brain shows remarkable neuroplasticity after unilateral lesions, utilizing unique developmental pathways. However, bilateral lesions can overwhelm these compensatory capacities, highlighting developmental limitations.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Neurology

Background:

  • Competing hypotheses, the Kennard and Hebb principles, debate early brain development and neuroplasticity.
  • The Kennard principle suggests superior compensatory capacities in immature brains, while the Hebb principle posits increased vulnerability to insults.

Purpose of the Study:

  • To investigate the interplay between the Kennard and Hebb principles in early brain development.
  • To provide evidence on the limits and potential of neuroplasticity following early brain lesions.

Main Methods:

  • The study examines neuroplasticity in response to unilateral and bilateral early brain lesions.
  • It analyzes the recruitment of homotopic areas and specific motor tracts for functional reorganization.

Main Results:

  • Unilateral lesions allow for hemispheric compensation and recruitment of ipsilateral motor tracts, unique to early development.
  • Language function can reorganize to the right hemisphere after early left-sided lesions.
  • Bilateral lesions, such as periventricular white matter lesions, significantly impact cortical architecture and function, indicating limitations.

Conclusions:

  • Neuroplasticity in early development is not absolute; it operates within ontogenetic potential.
  • The developing brain's compensatory capacity is limited, especially following bilateral insults.
  • Early brain lesions can interfere with crucial early network building, impacting long-term function.