What may have given modern humans an edge over Neanderthals, according to new research

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(CNN)From studying fossilized skulls, scientists know that the size of a Neanderthal's brain was the same as, if not slightly bigger than, that of a modern human. However, researchers have known little about Neanderthal brain development because soft tissue doesn't preserve well in the fossil record.

Now, an intriguing study released September 8 has revealed a potential difference that may have given modern humans, or Homo sapiens, a cognitive advantage over the Neanderthals, the Stone Age hominins who lived in Europe and parts of Asia before going extinct about 40,000 years ago.

Scientists at the Max Planck Institute of Molecular Cell Biology and Genetics in Dresden, Germany, said they have identified a genetic mutation that triggered the faster creation of neurons in the Homo sapiens brain. The Neanderthal variant of the gene in question, known as TKTL1, differs from the modern human variant by one amino acid.