More research points to rapid evolution

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Time changes modern human's face

By Rebecca Morelle
BBC News science reporter

Researchers have found that the shape of the human skull has changed significantly over the past 650 years.

Modern people possess less prominent features but higher foreheads than our medieval ancestors. Writing in the British Dental Journal, the team took careful measurements of groups of skulls spanning across 30 generations. The scientists said the differences between past and present skull shapes were "striking".

Plague victims

The team used radiographic films of skulls to record extensive measurements taken by a computer.They looked at 30 skulls dating from the mid-14th Century. They had come from the unlucky victims of the plague. The skulls had been excavated from plague pits in the 1980s in London.

Another 54 skulls examined by the team were recovered from the wreck of the Mary Rose which sank off the south coast of England in 1545.

All the skulls were compared with 31 recent orthodontic records from the School of Dentistry in Birmingham.

The two principal differences discovered were that our ancestors had more prominent features, but their cranial vault - the distance measured from the eyes to the top of the skull - was smaller.

Dr Peter Rock, lead author of the study and director of orthodontistry at Birmingham University, told the BBC News website: "The astonishing finding is the increased cranial vault heights.

"The increase is very considerable. For example, the vault height of the plague skulls were 80mm, and the modern ones were 95mm - that's in the order of 20% bigger, which is really rather a lot."

He suggests that the increase in size may be due to an increase in mental capacity over the ages. [emphasis added] ...

Story from BBC NEWS:
http://news.bbc.co.uk/go/pr/fr/-/2/hi/science/nature/4643312.stm

Published: 2006/01/25 09:12:59 GMT

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