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The End of Evolution.

Richard Brockman1

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PubMed
Summary
This summary is machine-generated.

Evolutionary science challenges Darwin's gradual speciation theory. Punctuated equilibria, marked by stasis and rapid change, shaped human evolution. The final shift, 50,000 years ago, may have removed Homo sapiens from natural selection.

Keywords:
NMDA receptor GluN2B subunitscalciumneurosciencepunctuated equilibriaspeciationworking memory

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Area of Science:

  • Evolutionary Biology
  • Paleontology
  • Human Origins

Background:

  • Charles Darwin's theory posits gradual speciation through slow, incremental change.
  • Eldredge and Gould proposed punctuated equilibria: long stasis followed by rapid change.
  • This challenges the traditional view of evolutionary progression.

Purpose of the Study:

  • To trace the progression from Darwinian evolution to punctuated equilibria.
  • To identify three key punctuated equilibria in the evolution of Homo sapiens.
  • To argue that the final equilibrium removed humans from natural selection.

Main Methods:

  • Analysis of paleontological data to identify patterns of stasis and rapid change.
  • Examination of the fossil record for evidence of evolutionary transitions.
  • Investigation of neurobiology and brain development as a factor in human evolution.

Main Results:

  • Two major evolutionary transitions are supported by fossil evidence.
  • A third, critical transition is linked to the development of the human brain.
  • This third transition occurred approximately 50,000 years ago.

Conclusions:

  • Homo sapiens evolved through periods of stasis punctuated by rapid change.
  • The final punctuated equilibrium, driven by brain development, set humans apart.
  • This event may signify a departure from traditional evolutionary pathways for humans.