Neanderthal brains 'grew more slowly'
A new study shows that Neanderthal brains developed more slowly than ours.
An analysis of a Neanderthal child's skeleton suggests that its brain was still developing at a time when the brains of modern human children are fully formed.
This is further evidence that this now extinct human was not more brutish and primitive than our species.
The research has been published in the journal Science.
Until now it had been thought that we were the only species whose brains develop slowly. Unlike other apes and more primitive humans modern humans have an extended period of childhood lasting several years.
This is because it takes time and energy to develop our large brain. Previous studies of Neanderthal remains indicated that they developed more quickly than modern humans - suggesting that their brains might be less sophisticated.
But a team led by Prof Antonio Rosas of the Museum of Natural Sciences in Madrid found that if anything, Neanderthal brains may develop more slowly than ours.
"It was a surprise," he told BBC News. "When we started the study we were expecting something similar to the previous studies," he told BBC News.
Prof Rosas and his team believe they are right and the previous studies are wrong because for the first time they were able to study a relatively complete skeleton of a child at a crucial stage in their development.
It was of a boy who was nearly seven-and-a-half years old when he died found in the 49,000-year-old site of El Sidrón, in Spain.
The boy's remains are exceptionally well-preserved and include a mix of baby and adult teeth, which enabled the team to accurately determine his age.
This brain is estimated to have been 87.5% of the size of an average adult Neanderthal brain upon death, whereas a modern humans child the same age would have on average a brain that was 95% the size of an adults.
The researchers also found that reveals that some of the small bones forming the boy's back bone were not fused. In modern humans, these bones tend to fuse by the time children reach the age of six.
According to Prof Rosas, the finding shows that Neanderthals were similar to our us.
The brutish primitive picture of Neanderthals is an old one. In the last few years there has been growing evidence to suggest that they were a human species with some small differences. Now we can say that the way their growth pattern is similar to ours too".
The finding raises the intriguing possibility that the Neanderthals' slightly slower brain development may mean that their brains may have been more advanced than ours. But Prof Rosas prefers a more prosaic interpretation.
"Neanderthals have a larger brain and larger body and so it is logical to think that the brain of the Neanderthal continues to grow for a little longer to allow their brains and bodies to get to their adult size"
Before this finding scientists believed that modern humans were the slowest growing species. Now we know that Neanderthals took slightly longer, suggesting that both species inherited this growth pattern from a now extinct common ancestor.
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