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Unveiling Japan's ancient practice of cranial modification: The case of the Hirota people in Tanegashima

Unveiling Japan's ancient practice of cranial modification: The case of the Hirota people in Tanegashima
A photograph of the ancient human remains found at the Hirota ruins. A notable characteristic of the remains is the wearing of many shell accessories, indicative of the culture and trade of the region at the time. Credit: The Kyushu University Museum

A team of biological anthropologists and archaeologists from Kyushu University and the University of Montana have broken new ground in our understanding on the practice of intentional cranial modification, a practice found in numerous ancient civilizations around the world.

Publishing in PLOS ONE, the team reports that the Hirota people, who lived on the southern Japanese island of Tanegashima around the 3rd century to 7th century CE, also partook in the practice. Moreover, the study found no significant differences in cranial modification between sexes, indicating that both males and females practiced intentional cranial modification.

Cranial modification is a form of body alteration where the head of a person is pressed or bound, usually at an early age, to permanently deform the . The practice predates written history, and researchers theorize that it was performed to signify group affiliation or demonstrate .

"One location in Japan that has long been associated with cranial deformation is the Hirota site on the Japanese island of Tanegashima, in Kagoshima Prefecture. This is a large-scale burial site of the Hirota people who lived there during the end of the Yayoi Period, around the 3rd century CE, to the Kofun Period, between the 5th and 7th century CE," explains Noriko Seguchi of Kyushu University's Faculty of Social and Cultural Studies who led the study.

"This site was excavated from 1957 to 1959 and again from 2005 to 2006. From the initial excavation, we found remains with cranial deformations characterized by a short head and a flattened back of the skull, specifically the occipital bone and posterior parts of the parietal bones."

Unveiling Japan's ancient practice of cranial modification: The case of the Hirota people in Tanegashima
Photograph of the Hirota site today in Tanegashima, Japan. Each marker indicates where burials were found along with the notes on their sex and approximate age group. Credit: The Kyushu University Museum

However, while the site provided an ideal opportunity to study the phenomenon, it had remained unclear whether these cranial modifications had been intentional, or were simply the unintended result of other habits.

To conduct the study, the research group employed a hybrid approach, utilizing 2D images to analyze the shape of the skulls' outline, as well as 3D scans of their surface. The group also compared crania data from other in Japan, such as the Doigahama Yayoi people in Western Yamaguchi, and the Kyushu Island Jomon people, who were the hunter-gatherer predecessors to the Yayoi people. Along with visually assessing skull morphology, the team gathered all this data and statically analyzed the contours and shapes between the skulls.

"Our results revealed distinct cranial morphology and significant statistical variability between the Hirota individuals with the Kyushu Island Jomon and Doigahama Yayoi samples," continues Seguchi. "The presence of a flattened back of the skull characterized by changes in the occipital bone, along with depressions in parts of the skull that connects the bones together, specifically the sagittal and lambdoidal sutures, strongly suggested intentional cranial modification."

Unveiling Japan's ancient practice of cranial modification: The case of the Hirota people in Tanegashima
3D images of skulls excavated from the Hirota site and the Doigahama site that the researchers used to compare skull morphology between the two groups. Notice that the skull from the Hirota site (right) has a more flattened back of the head compared to the skulls from the Doigahama site (left) indicating intentional cranial modification. Credit: Seguchi Lab/Kyushu University

The motivations behind this practice remain unclear, but the researchers hypothesize that the Hirota people deformed their crania to preserve and potentially facilitate long-distance trade of shellfish, as supported by found at the site.

"Our findings significantly contribute to our understanding of the practice of intentional cranial modification in ancient societies," concludes Seguchi. "We hope that further investigations in the region will offer additional insights into the social and cultural significance of this practice in East Asia and the world."

More information: Investigating intentional cranial modification: A hybridized two-dimensional/three-dimensional study of the Hirota site, Tanegashima, Japan, PLoS ONE (2023). DOI: 10.1371/journal.pone.0289219

Journal information: PLoS ONE

Provided by Kyushu University

Citation: Unveiling Japan's ancient practice of cranial modification: The case of the Hirota people in Tanegashima (2023, August 16) retrieved 4 March 2024 from https://phys.org/news/2023-08-unveiling-japan-ancient-cranial-modification.html
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