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3D automated quantification of asymmetries on fossil endocasts

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HAL Id: inserm-00592534

https://www.hal.inserm.fr/inserm-00592534

Submitted on 12 May 2011

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3D automated quantification of asymmetries on fossil

endocasts

Benoît Combès, José Braga, Francis Thackeray, Sylvain Prima

To cite this version:

Benoît Combès, José Braga, Francis Thackeray, Sylvain Prima. 3D automated quantification of asymmetries on fossil endocasts. 79th Annual Meeting of the American Association of Physical Anthropologists (AAPA), Apr 2010, Albuquerque, United States. pp.83-84, �10.1002/ajpa.21276�. �inserm-00592534�

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3D automated quantification of asymmetries on fossil endocasts

BENOÎT COMBÈS1, 2, 3, JOSÉ BRAGA4, FRANCIS THACKERAY5 and SYLVAIN

PRIMA1, 2, 3

1INSERM, U746, F-35042 Rennes, France

2INRIA, VisAGeS Project-Team, F-35042 Rennes, France

3University of Rennes I, CNRS, UMR 6074, IRISA, F-35042 Rennes, France 4Lab. of Anthropobiology AMIS, University Paul Sabatier, Toulouse, France 5Institute for Human Evolution, University of the Witwatersrand, South Africa

Over the last 15 years computed tomography (CT) has become a common way to obtain high resolution three-dimensional images of cranial endocast of hominids. Among the different features that can be seen on such endocasts, of key interest are their shape asymmetries. In particular, protrusions of the frontal and occipital lobes, as well as differences in their width, have been typically observed in modern humans' brains. These have been often hypothesized to be linked to functional specialization, and especially language and handedness. The

imprints of these protrusions on the inner surface of the skull are called the petalia. There is a lack of automated, reproducible and objective methods to quantify these protrusions and to assess (for instance) whether they are present in species other than Homo sapiens.

We propose a new method for the automated quantification of 3D endocranial shape

asymmetries. We mathematically define the symmetry plane of the endocast as the 3D plane which best superposes the "right" and "left" sides of the endocranial surface. Then, we

compute a 3D pointwise deformation field between the two sides of the endocast, allowing to match homologous points, and to assess their relative spatial position. The analysis of this 3D deformation field allows quantifying the shape asymmetries everywhere on the endocast. We illustrate our method on the endocast of Sts 5 (Mrs. Ples, Australopithecus africanus) whose very high resolution CT scan has been segmented using ITK-SNAP. The results suggest an opposite shape asymmetry in the fronto-temporal and occipital regions.

This abstract is part of the symposium entitled “Computational methods for the automated analysis of virtual hominid endocasts”, organized by Sylvain Prima, Gérard Subsol and José Braga.

This research supported by the French Institute for Research in Computer Science and Control (INRIA). Grant: 3D-MORPHINE (Collaborative Research Initiative).

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