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Functional precursors to language and its lateralization.

P F MacNeilage, M G Studdert-Kennedy, B Lindblom

    The American Journal of Physiology
    |June 1, 1984
    PubMed
    Summary
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    Language evolution is unique due to its frame-content structure, evolving from phonological to morphological levels. This structure may have roots in bimanual coordination and brain lateralization.

    Area of Science:

    • Linguistics
    • Evolutionary Biology
    • Neuroscience

    Background:

    • Language evolution must account for both language uniqueness and its evolutionary precursors.
    • Existing theories often overlook one of these critical aspects.

    Purpose of the Study:

    • To propose a model for language evolution reconciling uniqueness and precursors.
    • To identify the unique frame-content organizational structure of language.
    • To trace the evolutionary origins of this structure.

    Main Methods:

    • Comparative analysis of linguistic theories.
    • Hypothesizing evolutionary pathways from phonology to morphology.
    • Drawing parallels between linguistic structure and bimanual coordination.
    • Examining brain lateralization theories.

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    Main Results:

    • Language uniqueness stems from its dualistic frame-content organization at phonological and morphological levels.
    • The morphological level likely evolved from the phonological level.
    • Bimanual coordination, with its frame-hand (non-preferred) and content-hand (preferred), serves as a precursor to phonological frame-content organization.
    • Cortical lateralization for bimanual coordination may have preceded lateralization for language.

    Conclusions:

    • The frame-content model provides a unified account of language evolution.
    • Bimanual coordination and brain lateralization offer insights into the origins of language structure.
    • Further research into primate hand preferences can support these evolutionary hypotheses.