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Estimating fossil hominin body mass from cranial variables: An assessment using CT data from modern humans of known body mass

Authors

  • Marina Elliott,

    1. Human Evolutionary Studies Program and Department of Archaeology, Simon Fraser University, Burnaby, BC, Canada
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  • Helen Kurki,

    1. Department of Anthropology, University of Victoria, Victoria, BC, Canada
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  • Darlene A. Weston,

    1. Department of Anthropology, University of British Columbia, Vancouver, BC, Canada
    2. Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
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  • Mark Collard

    Corresponding author
    1. Human Evolutionary Studies Program and Department of Archaeology, Simon Fraser University, Burnaby, BC, Canada
    2. Department of Archaeology, University of Aberdeen, Aberdeen, Scotland
    • Correspondence to: Mark Collard, Human Evolutionary Studies Program and Department of Archaeology, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada V5A 1S6. E-mail: mcollard@sfu.ca

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ABSTRACT

Body mass estimates are integral to a wide range of inferences in paleoanthropology. Most techniques employ postcranial elements, but predictive equations based on cranial variables have also been developed. Three studies currently provide regression equations for estimating mass from cranial variables, but none of the equations has been tested on samples of known mass. Nor have the equations been compared to each other in terms of performance. Consequently, this study assessed the performance of existing cranial equations using computed tomography scans from a large, documented sample of modern humans of known body mass. Virtual models of the skull were reconstructed and measured using computer software, and the resulting variables were entered into three sets of published regression equations. Estimated and known body masses were then compared. For most equations, prediction errors were high and few individuals were estimated within ±20% of their known mass. Only one equation satisfied the accuracy criteria. In addition, variables that had been previously argued to be good predictors of mass in hominins, including humans, did not estimate mass reliably. These results have important implications for paleoanthropology. In particular, they emphasize the need to develop new equations for estimating fossil hominin body mass from cranial variables. Am J Phys Anthropol 154:201–214, 2014. © 2014 Wiley Periodicals, Inc.

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