Sulci 3D mapping from human cranial endocasts: A powerful tool to study hominin brain evolution

Area of Science:

• Paleoneurology
• Human Evolution
• Neuroscience

Background:

• Paleoneurology reconstructs hominin brain evolution using endocasts.
• Identifying cerebral sulci imprints in endocasts is crucial for understanding cortical organization.

Purpose of the Study:

• To document sulcal pattern imprints on extant human endocasts using a population-based atlas technique.
• To establish an innovative, non-invasive method for analyzing endocranial structural organization.

Main Methods:

• Micro-CT scanning of human crania from the Pretoria Bone Collection.
• Virtual extraction of endocasts, automatic sulci detection, and manual labeling.
• Application of a density map method to visualize mean sulcal imprint distribution and inter-individual variation.

Main Results:

• First documentation of superolateral cerebral sulcal pattern imprints on extant human endocasts.
• Visualization of frontal lobe sulci variation, correlating with brain MRI studies.
• Demonstration of extensive overlapping imprints in debated occipital lobe areas.

Conclusions:

• The developed analytical protocol provides a promising, observer-independent method for paleoneurology.
• This technique facilitates future research on hominin brain evolution and cognitive abilities.
• The study enhances our understanding of detailed endocranial characteristics and their evolutionary significance.