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The theory of encephalization.

H J Jerison

    Annals of the New York Academy of Sciences
    |September 30, 1977
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a new theory of encephalization based on dimensional requirements for brain construction. It views brain size as a combination of amplified repeated mappings and added tissue for new functions.

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    Area of Science:

    • Neuroscience
    • Comparative Biology
    • Evolutionary Biology

    Background:

    • The theory of encephalization explains variations in brain size relative to body size.
    • Existing models often rely on allometric analysis, which may not fully capture brain complexity.

    Purpose of the Study:

    • To develop a new theory of encephalization grounded in fundamental dimensional requirements.
    • To conceptualize brain construction as repeated mappings with amplification and added tissue.
    • To clarify the relationship between this theory, allometric analysis, and brain size.

    Main Methods:

    • Developing a theoretical framework based on dimensional analysis of brain construction.
    • Defining encephalization as a composite of an amplification factor (encephalization quotient) and added tissue.

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  • Relating the theory to empirical allometric analysis of brain and body size.

    • Main Results:

    • Encephalization is theorized as a composite of amplified repeated mappings and functionally specialized "added" tissue.
    • Body size is not fundamental but serves as one possible measure for basic mapping area.
    • The theory provides a framework for understanding "expected" brain size beyond simple allometry.

    Conclusions:

    • The proposed theory offers a novel perspective on brain evolution, emphasizing structural organization and functional addition.
    • It distinguishes between amplification of existing structures and the addition of new ones.
    • Further research can explore the neurobiological correlates and behavioral implications of this theoretical model.