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Fabrication of an Expandable Brain Matrix Customizable Across Developmental Stages
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Evolution of brain elaboration.

Sarah M Farris1

  • 1Department of Biology, West Virginia University, 3139 Life Sciences Building, 53 Campus Drive, Morgantown, WV 26505, USA sarah.farris@mail.wvu.edu.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|November 11, 2015
PubMed
Summary
This summary is machine-generated.

Large, complex brains evolved independently across animal groups, driven by sensory needs and cognitive abilities. Common developmental mechanisms and deep homology explain shared brain structures despite diverse evolutionary paths.

Keywords:
cerebral cortexcognitivemushroom body

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Area of Science:

  • Evolutionary Biology
  • Neuroscience
  • Comparative Anatomy

Background:

  • Large, complex brains have evolved independently in diverse animal lineages (protostomes and deuterostomes).
  • Brain evolution shows sensory centers scaling with modality importance, often retaining similar circuit architectures.
  • Selective pressures for larger integrative brain centers and their link to cognitive abilities are less understood.

Purpose of the Study:

  • To investigate the evolutionary drivers and developmental mechanisms behind the independent evolution of large, complex brains across Bilateria.
  • To explore the commonalities in brain architecture and developmental processes despite divergent evolutionary trajectories.
  • To understand the role of deep homology and homoplasy in shaping bilaterian nervous systems.

Main Methods:

  • Comparative analysis of brain evolution across protostome and deuterostome lineages.
  • Examination of developmental gene expression patterns and their role in brain domain formation.
  • Investigation of cellular mechanisms, such as neuroblast proliferation, contributing to brain size increase.

Main Results:

  • Evolutionary increases in brain size are associated with enhanced cognitive functions like learning and memory, and sometimes social behavior or spatial learning.
  • Despite independent evolution, large brains across divergent taxa (e.g., vertebrates, insects) share common architectural features.
  • These similarities arise from both deep homology (shared developmental gene expression) and homoplasy (convergent modifications like increased neuroblast numbers).

Conclusions:

  • Convergent evolution (homoplasy) and deep homology contribute to the common features observed in large, complex brains across Bilateria.
  • A limited set of developmental mechanisms likely underlies the independent evolution of structural and functional brain diversity.
  • Understanding these shared mechanisms provides insight into the fundamental principles of nervous system evolution.