ArticleScientific reports2026
Spontaneous cephalic oscillations in vertebrate embryos support the Inside Story scenario of human development and evolution.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
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.
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