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Related Concept Videos

Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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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 contrast, determination...
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Related Experiment Video

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Statistical Modelling of Cortical Connectivity Using Non-invasive Electroencephalograms
08:51

Statistical Modelling of Cortical Connectivity Using Non-invasive Electroencephalograms

Published on: November 1, 2019

Development and evolution: two determinants of cortical connectivity.

Giorgio M Innocenti1

  • 1Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden. Giorgio.Innocenti@ki.se

Progress in Brain Research
|April 15, 2011
PubMed
Summary
This summary is machine-generated.

Nervous system development and evolution create diversity in neuronal components, particularly cortical axons. Axon diameter variation and pathway differences enhance neural communication speeds across species.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Genotypic and phenotypic diversity are outcomes of nervous system development and evolution.
  • Cortical axons differentiate into various phenotypes crucial for neural computation.

Purpose of the Study:

  • To explore the differentiation of axonal phenotypes, focusing on axon diameter diversity.
  • To understand how this diversity impacts interneuronal communication over time.

Main Methods:

  • Analysis of axonal phenotypes, including diameter, length, and arborization.
  • Comparative study across development, within, and across species.

Main Results:

  • Axon diameter diversity is enhanced by a small proportion of thicker axons in specific pathways.
  • Variations in pathway length and brain volume rescale the temporal range of neural communication.

Conclusions:

  • Axonal phenotype differentiation, including diameter and arbor structure, is driven by genetic variation, overproduction, and environmental selection.
  • This process is fundamental to both nervous system development and evolution.