Sexual dimorphism in the Japanese cranial base

A Fourier‐wavelet representation

Dados Bibliográficos

ID8312422
AutoresPete E Lestrel (University of California, Los Angeles, autor correspondente), Roberto M César (0000-0003-2701-4288, Universidade de São Paulo), Osamu Takahashi (0000-0002-6454-3990, Nihon University), Eisaku Kanazawa (Nihon University)
Ano2005
Volume128
Fascículo3
Páginas608-622
Data de publicação2005-11-01
Peer ReviewedSim
Open AccessSim
TipoARTICLE
PeriódicoAmerican Journal of Physical Anthropology (JOURNAL)
Identificadores do periódicoISSN: 0002-9483 • E-ISSN: 1096-8644
EditoraWiley (PUBLISHER • GB)
DOI10.1002/ajpa.20209
PMID15895430
OpenAlexW2117282827
IdiomaEN
Citações recebidas6
Referências citadas24

An approach, computational shape analysis (CSA), is presented here which utilizes a Fourier‐wavelet representation to numerically describe shape features of biological forms. Two elements are involved: 1) elliptical Fourier functions (EFFs), to provide estimates of global aspects , and 2) continuous wavelet transforms (CWTs) to generate an objective estimate of localized features . EFFs are computed, using a set of pseudohomologous points, to create a precise analog of the boundary. This computed contour is then normalized by scaling and rotated in two‐dimensional space to insure a representation that is invariant with respect to starting point, size, and orientation. The predicted point coordinates derived from the EFFs are submitted to CWT for further processing. Wavelet coefficients are then computed to identify localized features, localization being a subjective process with EFFs. The advantage of wavelets is that they eliminate the inevitable subjectivity inherent in the choice of measurements. To test the usefulness of CSA, a sample of cranial base (CB) lateral radiographic outlines was available. Five archaeological periods, Yayoi, Kofun, Kamakura, Edo, and Modern, were utilized (n = 297). Statistically significant differences in sex and archaeological age were found. Although archaeological age differences were present, they were small and random in character, suggesting stability in the CB structures. In contrast, sexually dimorphic differences were present in every group from the Yayoi to the Modern period. This presence of sexually dimorphic differences in shape was consistent with earlier studies of M. nemestrina , G. gorilla , and P. troglodytes . Consequently, it is suggested that the pattern of sexual dimorphism documented in the Japanese CB is a primate pattern with an ancient evolutionary history. The results demonstrate, both visually and numerically, that CSA is a powerful approach for describing both global and localized features of craniofacial structures such as the CB. Am J Phys Anthropol, 2005. © 2005 Wiley‐Liss, Inc

Biology · Fourier transform · Geometry · Gorilla · Mathematical analysis · Multidimensional scaling · Pattern recognition (psychology) · Representation (politics) · Sexual dimorphism · Statistics · Wavelet · Zoology · Artificial Intelligence · Computer Science · Image Retrieval and Classification Techniques · Mathematics · Morphological variations and asymmetry · Paleontology · Pleistocene-Era Hominins and Archaeology