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Evolutionarily conserved neural dynamics across mice, monkeys, and humans.

Olivier Codol, Margaux Asclipe, Anton R Sobinov

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    Summary

    Neural computations for movement are remarkably conserved across species, from mice to humans. Evolution preserves fundamental brain dynamics despite diverse behaviors, highlighting shared circuit constraints.

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    Area of Science:

    • Neuroscience
    • Evolutionary Biology
    • Comparative Psychology

    Background:

    • Brain circuits evolve to support species-specific survival needs.
    • Homologous brain regions may or may not use similar computations for common behaviors across species.
    • Understanding neural computation conservation is key to deciphering brain evolution.

    Purpose of the Study:

    • To investigate the conservation of neural computations in homologous motor cortex regions across species.
    • To determine if motor cortical population dynamics are conserved during survival-critical behaviors in mice, monkeys, and humans.

    Main Methods:

    • Intracortical recordings from the motor cortex of mice, monkeys, and humans during motor tasks.
    • Analysis of neural population dynamics and trajectory geometries.
    • Manipulation of neural network models trained on reaching movements.

    Main Results:

    • Movement-related neural dynamics were highly conserved across species (mouse, monkey, human).
    • Behavioral output variations were explained by unique neural trajectory geometries.
    • Cross-species neural dynamics were more conserved than within-species regional or temporal variations.

    Conclusions:

    • Neural computations, specifically motor cortical population dynamics, are conserved across distantly related species.
    • Evolutionary constraints likely drive the conservation of neural dynamics, enabling diverse behavioral repertoires.
    • Fundamental neural computations are maintained through phylogeny despite expanding behavioral complexity.