Error Intraobservador en El Análisis Paleohistológico De Superficies Craneofaciales

Aporta, Natalia Brachetta

doi:10.17139/raab.2016.0018.02.07

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…These analyses were done in tpsUtil v1.46, tpsDig2 v2.17, and tpsSuper v2.03 (Rohlf, ). Third, a digital grid was placed on the homologized maps to register the information of bone remodeling contained in each cell (Brachetta‐Aporta & Gobbo, ). The size of the cells was set to maximize the chances of having only one type of activity and the information was registered as (−1) presence of bone resorption, (1) presence of bone formation, (0) no information available, on the basis of the type of surface with highest frequency in the cell.…”

Section: Methodsmentioning

confidence: 99%

Variation in facial bone growth remodeling in prehistoric populations from southern South America

Brachetta-Aporta

González

Bernal

2019

American J Phys Anthropol

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Objectives: To assess the intraspecific variation in bone remodeling patterns in modern humans, we studied two populations from southern South America that represent the extremes of morphological variation in this region. We particularly analyzed the ontogenetic changes in the patterns of bone growth remodeling and compared the patterns between samples. Materials and methods:We obtained high-resolution casts of the periosteal surface of the upper and middle face of subadults (n = 36) and adult (n = 36) individuals from a sample of hunter-gatherers from Patagonia and a sample of horticulturists from Northwest Argentina. The areas of bone formation and resorption were registered using an incident-light microscope. We then estimated the average bone remodeling map by sample and age, and performed principal component analysis and multivariate regressions to assess the extension and distribution of these areas across ontogeny and between samples. Results:We found that the remodeling pattern of the glabella, supraorbital arch, frontal process of the maxilla, and a large part of the zygomatic bone is relatively constant in subadults and adults from both sample with a clear predominance of bone formation. In contrast, the middle face is characterized by the spatial alternation between formation and resorption areas, and greater variation with age and between samples.The main differences were found in areas related to chewing and muscle insertions. Conclusions:Our study provides the first evidence of interpopulation variation in bone growth remodeling and suggests that biomechanical factors can influence the observed patterns. It also underlines the need to account for ecological factors in within and between species comparisons. K E Y W O R D Sbone formation and resorption surfaces, ontogeny, paleohistology, population variation

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Section: Methodsmentioning

confidence: 99%

Variation in facial bone growth remodeling in prehistoric populations from southern South America

Brachetta-Aporta

González

Bernal

2019

American J Phys Anthropol

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“…El relevamiento de los CE se realizó por el mismo observador (VR) en dos ocasiones con cada método y se testeó el error intraobservador mediante el índice Kappa (k), que proporciona el grado de acuerdo entre pares de observaciones por encima del esperado por azar (Bernal, González, Pérez y Del Papa, 2004;Cohen, 1960). Para el relevamiento de los CE se consideraron entesis de los miembros superiores e inferiores, 17 en el método HyM y 16 para el método Co (Tabla 1).…”

Section: Procesamiento Y Análisis De Datosunclassified

Cambios entesiales en una muestra bioarqueológica del Noreste de Patagonia: una comparación metodológica

Romano

Serna

2019

RevArgAntropBiol

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En este trabajo se presenta la primera aproximación al estudio de cambios entesiales sobre restos humanos procedentes del noreste de Patagonia. Teniendo en cuenta que dos de los métodos de registro frecuentemente utilizados están basados en supuestos diferentes, “Hawkey y Merbs” y “Coimbra”, se propone comparar y discutir los resultados obtenidos a partir de la aplicación de ambos y la implementación de una nueva medida de cuantificación. Para ello, se analizan elementos óseos del miembro superior e inferior en una muestra procedente del valle medio del río Negro. Se calculó el error intraobservador y el análisis de los datos se basó en dos medidas de cuantificación: la presencia de al menos un cambio y el Índice de Afectación. La comparación entre métodos muestra tendencias diferentes. Mediante Hawkey y Merbs no se observa una tendencia clara de afectación, y desde Coimbra un mayor compromiso del miembro inferior.

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“…The type of bone surface assigned to a given location with missing data and the extension of such areas are based on qualitative criteria set by the observer, and are thus hardly reproducible. This not only means that reconstructions made by different observers can differ, but also that the assumptions underlying such differences cannot be assessed (Brachetta‐Aporta, ). Moreover, the qualitative procedures ignore the uncertainties inherent to any reconstruction process, which need to be taken into account for validating the inferences made on the basis of estimated data (Gunz et al.…”

Section: Introductionmentioning

confidence: 99%

A quantitative approach for analysing bone modelling patterns from craniofacial surfaces in hominins

2017

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Bone size and shape arise throughout ontogeny as a result of the coordinated activity of osteoblasts and osteoclasts, responsible for bone deposition and resorption, and growth displacements. The modelling processes leave specific microstructural features on the bone surface, which can be used to infer the mechanisms shaping craniofacial traits in extinct and extant species. However, the analysis of bone surfaces from fossils and archaeological samples faces some difficulties related to the bone loss caused by taphonomic factors, and the lack of formal methods for estimating missing information and comparing the patterns of bone modelling among several specimens and samples. The present study provides a new approach for the quantitative analysis of bone formation and resorption patterns obtained from craniofacial surfaces. First, interpolation techniques were used to estimate missing data on high-resolution replicas of the left maxilla in a sample of sub-adult and adult modern humans and sub-adult fossil hominins. The performance of this approach was assessed by simulating variable amounts of missing data. Then, we applied measures of dispersion and central tendency to represent the variation and average pattern of bone modelling within samples. The spatial interpolation resulted in reliable estimations of the type of cell activity (deposition or resorption) in the missing areas, even when large extensions of the bone surface were lost. The quantification of the histological data allowed us to integrate the information of different specimens and depict the areas with higher and lower variation in the bone modelling pattern of the maxilla among specimens. Overall, the main advantages of the quantitative approach used here for generating bone modelling patterns are the high replicability and the possibility of incorporating variation among specimens into the comparisons among samples.

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Error Intraobservador en El Análisis Paleohistológico De Superficies Craneofaciales

Cited by 5 publications

References 24 publications

Variation in facial bone growth remodeling in prehistoric populations from southern South America

Variation in facial bone growth remodeling in prehistoric populations from southern South America

Cambios entesiales en una muestra bioarqueológica del Noreste de Patagonia: una comparación metodológica

A quantitative approach for analysing bone modelling patterns from craniofacial surfaces in hominins

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