Scientists set eyes on virtual Neanderthal 'brain'
Scientists have for the first time set eyes on a three-dimensional Neanderthal brain in the form of a virtual model made to fit the empty, fossilised skulls of long-dead individuals, a study said Thursday.
The reconstructed organ confirmed earlier observations, based more loosely on head size and shape, that Neanderthals had a larger brain than their early Homo sapiens cousins, but with a smaller cerebellum -- the lower part near the spine that controls balance and movement.
It is also involved in speech and learning.
The distinction may have caused social and cognitive differences between the near relatives, and may explain why one went extinct while the other thrived, said Naomichi Ogihara of the Keio University in Japan, who co-authored a study in the journal Scientific Reports.
"Although the difference could be subtle, such a subtle difference may become significant in terms of natural selection," he told AFP.
But nothing can be concluded yet about any relation between the Neanderthal's brain organisation and its eventual demise.
Ogihara and a team combined the disciplines of physical anthropology, mechanical engineering, and neuroscience for their reconstruction.
They used virtual casts to model the shape and size of four fossilised Neanderthal skull cavities, and four of ancient humans.
They then used MRI scans from nearly 1,200 modern-day people to model an "average" human brain, which they "deformed" to fit into the prehistoric skulls.
This allowed the team to estimate what the brains would have looked like, and how individual regions would have differed between the two species.
"We are so far from understanding the brain of prehistoric humans that any small advance is welcome," French palaeoanthropologist Antoine Balzeau told AFP of the study.
He was not involved in the research.
Neanderthals emerged in Europe, Central Asia and the Middle East some 200,000 years ago. They vanished about 30,000 years ago -- coinciding roughly with the arrival of modern humans out of Africa.
The two groups briefly overlapped and interbred, and today, non-African people carry about 1.5-2.1 percent of Neanderthal DNA.
Long portrayed as knuckle-dragging brutes, recent studies have started to paint a picture of Neanderthals as sophisticated beings who made art, took care of the elderly, buried their dead, and may have been the first jewelers -- though they were probably also cannibals.
I often find myself wondering whether the remains of those two little ice caps I studied back in the early 1980s will survive another summer. Scientists are trained to be skeptics, but for those of us who study the Arctic, it is clear that a radical transformation is underway. My two ice caps are just a small part of that story. Indeed, the question is no longer whether the Arctic is warming, but how drastically it will change – and what those changes mean for the planet.
So do you know whether the earth is round? It turns out it depends on context. But in most regular contexts then, yes, you do. And that’s even though I doubt most people could prove it, right here and now.
The best physicians can do in the short term is to respect what patients tell us and try to gain insight into any of our own biases that could lead us to underestimate a patient’s experience of pain.
GETTY IMAGES NORTH AMERICA/AFP/File / JOE RAEDLE
AFP/File / VALERY HACHE
AFP/File / Helene Valenzuela