WorldCat Identities

Baab, Karen L.

Overview
Works: 6 works in 7 publications in 1 language and 8 library holdings
Roles: Author
Publication Timeline
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Most widely held works by Karen L Baab
Cranial shape variation in homo erectus by Karen L Baab( )

2 editions published in 2007 in English and held by 3 WorldCat member libraries worldwide

The role of neurocranial shape in defining the boundaries of an expanded Homo erectus hypodigm by Karen L Baab( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Using modern human cortical bone distribution to test the systemic robusticity hypothesis( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

Abstract: The systemic robusticity hypothesis links the thickness of cortical bone in both the cranium and limb bones. This hypothesis posits that thick cortical bone is in part a systemic response to circulating hormones, such as growth hormone and thyroid hormone, possibly related to physical activity or cold climates. Although this hypothesis has gained popular traction, only rarely has robusticity of the cranium and postcranial skeleton been considered jointly. We acquired computed tomographic scans from associated crania, femora and humeri from single individuals representing 11 populations in Africa and North America (n =228). Cortical thickness in the parietal, frontal and occipital bones and cortical bone area in limb bone diaphyses were analyzed using correlation, multiple regression and general linear models to test the hypothesis. Absolute thickness values from the crania were not correlated with cortical bone area of the femur or humerus, which is at odds with the systemic robusticity hypothesis. However, measures of cortical bone scaled by total vault thickness and limb cross-sectional area were positively correlated between the cranium and postcranium. When accounting for a range of potential confounding variables, including sex, age and body mass, variation in relative postcranial cortical bone area explained <"0% of variation in the proportion of cortical cranial bone thickness. While these findings provide limited support for the systemic robusticity hypothesis, cranial cortical thickness did not track climate or physical activity across populations. Thus, some of the variation in cranial cortical bone thickness in modern humans is attributable to systemic effects, but the driving force behind this effect remains obscure. Moreover, neither absolute nor proportional measures of cranial cortical bone thickness are positively correlated with total cranial bone thickness, complicating the extrapolation of these findings to extinct species where only cranial vault thickness has been measured
The shape of human evolution : a geometric morphometrics perspective by Karen L Baab( )

1 edition published in 2012 in English and held by 1 WorldCat member library worldwide

Keeping asymmetry in perspective : a reply to Eckhardt and Henneberg by Kieran P McNulty( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

The impact of superimposition choice in geometric morphometric approaches to morphological integration by Karen L Baab( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

 
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Audience Level
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  Kids General Special  
Audience level: 0.84 (from 0.64 for Cranial sh ... to 0.99 for The role o ...)

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