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Related Experiment Videos

Brain homology and function: an uneasy alliance.

Georg F Striedter1

  • 1Department of Neurobiology and Behavior, University of California at Irvine, Irvine, CA 92697-4550, USA. gstriedt@uci.edu

Brain Research Bulletin
|March 30, 2002
PubMed
Summary

Understanding brain evolution requires moving beyond structural homology. This study explores how brain functions change across species, challenging the assumption that structure dictates function and proposing a new theory for evolutionary brain changes.

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Area of Science:

  • Comparative neurobiology
  • Evolutionary biology
  • Neuroscience

Background:

  • Current research often assumes functional homology can be inferred from structural homology across species.
  • This "extrapolationist" approach has shown success in molecular biology and comparative neurobiology, such as similar hippocampal functions in birds and mammals.
  • However, this assumption overlooks evolutionary changes in brain function, as evidenced by historical lesion studies.

Purpose of the Study:

  • To challenge the extrapolationist assumption in comparative neurobiology.
  • To address the limitations of inferring function solely from structure.
  • To outline a theoretical framework for understanding evolutionary changes in brain function.

Main Methods:

  • Review of historical lesion studies and their interpretation.

Related Experiment Videos

  • Analysis of the concept of "functional encephalization" and its limitations.
  • Theoretical development of a new approach to study evolutionary brain function.

    • Main Results:

    • The "extrapolationist" assumption can hinder progress by ignoring functional evolution.
    • Historical lesion studies revealed species-specific differences in brain function, previously attributed to "functional encephalization."
    • A need exists for a new theory to explain these species differences in lesion effects.

    Conclusions:

    • A theory of evolutionary changes in brain function is needed.
    • Rethinking the relationship between structural and functional homology is crucial.
    • Future research should focus on how brain functions evolve dynamically across species.