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Were Pre-Historic Dinosaurs Virtually ‘Brain-Less’?


Finally evidence that reinforces widely held view that size doesn’t matter when it comes to brain has been proved with an extinct dinosaur’s little brain that measured equal to a tennis in a double-decker bus, that can be said to be “no brain” in other parlance.

The dinosaur braincases belonged to a 72-million-year-old species that had a brain of just 6k3cm big, according to UK scientists. The rare sauropod’s complete braincase was found in Europe and it helped scientists assess how the brains of dinosaurs operated, including their intellectual and sensory abilities.

Dinosaur skull found in Spain

Dinosaur skull found in Spain.All images courtesy of Oscar Sanisidro

The team have digitally reconstructed the cavity where the brain lay, the passages of the cranial nerves and certain blood vessels as well as the labyrinth of the inner ear.

In a paper published in the journal PLOS ONE, the team led by a senior research fellow from The University of Manchester, and including Larry Witmer (Ohio University), Ryan Ridgely (Ohio University), Francisco Ortega (UNED) and Jose Luis Sanz (UAM) describes the rare skull, particularly the braincases, which are very fragile so not many have survived. That is not the case with this find, which is remarkably complete.

The skull, from a titanosaur, a type of sauropod, was found at a dig site in eastern Spain in 2007 and experts have spent the last few years studying it to see what secrets it may reveal.

Dr Fabien Knoll of the University of Manchester, said: “This is such a rare finding that is why it is so exciting. Usually we find vertebrae or other bones, very rarely the braincase and this one is complete. I was present on the dig site when it was uncovered and it was a very special moment… Research such as this is fundamental if we want to get an idea about the cognitive skills of these animals or if they had keen hearing or good eyesight and plenty of other information.”

The titanosaur lived about 72 million years ago and like other sauropods it was four-legged with a long neck and a long tail and herbivorous. It was a distant relative of Diplodocus but, with about 14m in length, it was only half the expected size. The study shows that its brain fitted in a diminutive cavity of only 6.3 cm in length.

Dr Knoll, who made the first digital reconstruction of a dinosaur endocranial cavity in the late 1990s, said: “In a few years’ time if more finds like this come to light and, above all, if they are studied with the modern imaging technologies then we could really start to understand more about dinosaur brains.”

One comment

  1. Yes. Thus they couldn’t duck the asteroid which killed them.

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