More surfaces. This week we have published a surface comparison of the frontal endocranial morphology in OH9, Buia, and Bodo. The methods are the same applied previously by Amélie Beaudet and colleagues. Despite the importance generally assigned to the frontal cortex in our species, paleoneurology has not managed to reveal clear and patent changes in its gross form. Endocasts can only supply information on the general external appearance of the cortical anatomy, so we should expect they cannot be used to trace many aspects associated with evolutionary variations. Also, the bad habits to defend firm statements based on single (and often reconstructed and fragmented) individuals unpleasantly crashes against the basic scientific principle of hypothesis testing, something that needs quantification, large samples and statistics. In this paper we compare these three specimens with the general scope of discussing some issues about frontal lobe evolution and paleoneurology. When compared with a modern human endocast, the younger fossils (Buia and Bodo) display flatter dorsal-lateral areas, while the older one (OH9) show a more extensive flattening of the whole dorsal surface. They all fit within a general trend observed in humans and hominoids: the more the eyes go below the frontal cortex, the more the frontal lobe bulges. So it seems reasonable to think that the curvature of the frontal lobes is but a structural consequence of the spatial relationships between face and braincase. In paleoneurology, we should exclude structural changes (cranial constraints and secondary consequences) if we want to localize functional ones, or if we want to reveal specific adaptations and primary evolutionary variations. Surface analysis is one more tool to go in that direction.
apes Atapuerca Australopithecus brain-artefact interface brain atlas brain biology braincase brain size brain thermoregulation CENIEH Cercopithecoids chimpanzee China cognitive archaeology corpus callosum cortical folding cortical surface cranial thickness diploic channels eLearning embodiment encephalization endocranial ontogeny endocranial volume evo-devo extended mind fossil endocasts Frederick Coolidge frontal bone frontal lobes functional craniology geometric morphometrics hemispheric asymmetries Holocene Homo erectus human ethology human genus intraparietal sulcus Konrad Lorenz Institute language Le Moustier macaque Malu Cave mammals metopic suture Mezmaiskaya modern humans myopia Neandertals occipital lobes orbits paleoneurology Pan paniscus Pan troglodytes parietal bone parietal lobes petalia Philipp Gunz Phillip Tobias photography precuneus primate brain sexual dimorphism shape analysis Simon Neubauer social primatology species concept subparietal sulcus sulcal patterns sulci symbolic thinking Taung child University of Colorado University of Liverpool visuospatial integration
- Losing Key DNA Made Us Modern Humanshttps://www.scientificamerican.com/article/losing-key-dna-made-us-modern-humans/
- DECODING MIMBRES PAINTINGThis extended abstract represents a summary introduction to a work in progress, which will culminate in a publication and exhibition at The Los Angeles County Museum of Art in 2018. It briefly outlines our discoveries and interpretations, which will be more fully presented, referenced and discussed in the forthcoming catalog. This presentation is available f […]
- Craniovascular traitsThis month we have published a review on craniovascular traits and anthropology, freely available to download from the Journal of Anthropological Sciences. The article describes many vascular traits that can be analyzed on skulls, through the traces they leave on the bone surface or within the bone itself. The traces of the middle meningeal vessels, […]
- Incredible New Evidence for Peopling of the Americas 130,000 Years AgoIt is pretty well agreed that Homo sapiens spread out of Africa about 100,000 years ago and traveled across Asia about 60,000 …Continue reading →
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- How to become a super memorizer – and what it does to your brainNew research shows that we can train our brains to become memory champions To many of us, having to memorize a long list of items feels like a chore. But for others, it is more like a sport. Every year, hundreds of these ‘memory athletes’ compete with one another in the World Memory Championships, memorising hundreds of words, numbers, or other pieces of inf […]
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