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Model-based inferring of Neanderthal upper cervical spine motion.

Carlos Aurelio Palancar1, Markus Bastir2, Benoit Beyer3

  • 1Group of Paleoanthropology, Department of Paleobiology, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain, palancar.carlos@gmail.com.

Journal of Anthropological Sciences = Rivista Di Antropologia : JASS
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Summary
This summary is machine-generated.

This study used Procrustes Motion Analysis (PMA) and predictive modeling to assess Neanderthal neck mobility. The findings suggest Neanderthals had comparable upper cervical spine (UCS) flexion-extension to modern humans, challenging previous assumptions.

Keywords:
Flexion-extensionMobilityNeanderthalNeckRange of motion

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Area of Science:

  • Paleoanthropology
  • Functional Morphology
  • Biomechanics

Background:

  • Previous hypotheses suggested reduced neck mobility in Neanderthals based on morphology.
  • Direct measurement of fossil kinematics is impossible.

Purpose of the Study:

  • To illustrate the potential of Procrustes Motion Analysis (PMA) combined with predictive modeling for studying fossil functional morphology.
  • To model and compare the upper cervical spine (UCS) flexion-extension kinematics of the La Ferrassie 1 Neanderthal and modern humans.

Main Methods:

  • Utilized 3D virtual morphology of the La Ferrassie 1 Neanderthal and modern human specimens (occipital base, C1, C2).
  • Applied PMA to analyze shape-motion relationships in modern humans to build a predictive model.
  • Applied the predictive model to Neanderthal UCS morphology to infer potential motion trajectory.

Main Results:

  • The inferred flexion-extension trajectory for La Ferrassie 1 was statistically comparable to the modern human sample.
  • Challenged assumptions of reduced Neanderthal neck mobility based on model-based results.
  • Demonstrated no significant difference in UCS flexion-extension between the Neanderthal specimen and modern humans.

Conclusions:

  • Procrustes Motion Analysis (PMA) integrated with predictive modeling is a robust tool for paleoanthropological functional morphology.
  • The study provides a new framework for investigating hominin kinematics using empirical data and predictive modeling.
  • Neanderthal upper cervical spine (UCS) flexion-extension kinematics were predicted to be similar to modern humans.