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<p>It has been suggested for long that physical laws might constrain vertebrate development. Specifically, in hominins, it is observed that the head flexes forward as it dilates, as if there existed an internal correlation between head flexure and brain size. Such an internal correlation would contribute to explain why the face becomes less prognathous as the brain expands. I report here the discovery of spontaneous oscillations in the vertebrate embryo head, which show an intrinsic positive dynamic correlation between head flexure and brain dilation. This spontaneous oscillatory behavior demonstrates the existence of a robust biomechanical hinge inside the embryonic head, of textural origin, contributing to the tendency observed in hominins.</p>

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Spontaneous cephalic oscillations in vertebrate embryos support the Inside Story scenario of human development and evolution

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月29日

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  • Vincent Fleury

摘要

It has been suggested for long that physical laws might constrain vertebrate development. Specifically, in hominins, it is observed that the head flexes forward as it dilates, as if there existed an internal correlation between head flexure and brain size. Such an internal correlation would contribute to explain why the face becomes less prognathous as the brain expands. I report here the discovery of spontaneous oscillations in the vertebrate embryo head, which show an intrinsic positive dynamic correlation between head flexure and brain dilation. This spontaneous oscillatory behavior demonstrates the existence of a robust biomechanical hinge inside the embryonic head, of textural origin, contributing to the tendency observed in hominins.