Mapping sexual dimorphism signal in the human cranium

Area of Science:

• Forensic Anthropology
• Human Osteology
• Paleoanthropology

Background:

• Accurate sex identification from human crania is crucial for fields like human evolution and osteology.
• Current methods rely on subjective visual inspection, introducing potential user bias.
• Objective, quantitative approaches are needed to enhance reliability in sex estimation.

Purpose of the Study:

• To develop and validate a novel landmark-based approach for automatically mapping sexual dimorphism on the human cranium.
• To identify specific cranial regions exhibiting the most significant dimorphism considering shape, form, and size.
• To establish an objective tool for sex determination from skeletal remains.

Main Methods:

• Utilized a dataset of 228 individuals with known sex from diverse geographical origins.
• Applied a landmark-based methodology to quantify and map sexual dimorphism signals across the cranium.
• Analyzed cranial regions for shape, form, and size variations indicative of sex.

Main Results:

• The automated approach identified glabellar, supraciliary, mastoid, and nasal regions as highly sexually dimorphic.
• Individual regions achieved 73% accuracy in sex identification, increasing to 77% when combined.
• The occipital external protuberance showed variation primarily related to size, not sexual dimorphism.

Conclusions:

• The developed landmark-based method offers an objective and potentially less biased alternative for sex estimation from cranial morphology.
• This approach can enhance the accuracy and consistency of sex determination in osteological and forensic contexts.
• The methodology holds potential for mapping other variable signals within skeletal morphology.