Language and tool-making skills evolved at same time, study says

Sep 02, 2013
Three hand axes produced by participants in the experiment. Front, back and side views are shown.

(Phys.org) —Research by the University of Liverpool has found that the same brain activity is used for language production and making complex tools, supporting the theory that they evolved at the same time.

Researchers from the University tested the of 10 expert stone tool makers (flint knappers) as they undertook a stone tool-making task and a standard language test.

Brain blood flow activity measured

They measured the brain blood flow activity of the participants as they performed both tasks using functional Transcranial Doppler Ultrasound (fTCD), commonly used in clinical settings to test patients' language functions after brain damage or before surgery.

The researchers found that for both tasks correlated, suggesting that they both use the same area of the brain.  Language and stone tool-making are considered to be unique features of humankind that evolved over millions of years.

Darwin was the first to suggest  that tool-use and language may have co-evolved, because they both depend on complex planning and the coordination of actions but until now there has been little evidence to support this.

Dr Georg Meyer, from the University Department of Experimental Psychology, said:  "This is the first study of the brain to compare complex stone tool-making directly with language.

Language and tool-making skills evolved at same time
The brain activity of an experienced flint-knapper is monitored using a Transcranial Doppler Ultrasound, as he works the stone.

Tool use and language co-evolved

"Our study found correlated blood-flow patterns in the first 10 seconds of undertaking both tasks.  This suggests that both tasks depend on common and is consistent with theories that tool-use and language co-evolved and share common processing networks in the brain."

Dr Natalie Uomini from the University's Department of Archaeology, Classics & Egyptology, said: "Nobody has been able to measure brain activity in real time while making a stone tool. This is a first for both archaeology and psychology."

The research was published in PLOS ONE.

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More information: dx.plos.org/10.1371/journal.pone.0072693

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adave
1 / 5 (1) Oct 29, 2013
The comparison implys that the language was spoken. Modern man can speak with hand gestures at over 100 words per minute. It's called typing. The early brain was quiet like when you are painting, sculpting or hunting. Comic strip art did not occur in primative man to convey an event. So they did not have an evolved spoken language. You can find human calls in singing but not in scientific language. You have an old quiet mind and a new mind developed recently to show how to hunt in art, Geometric decoration, invention, war, logic, science and mathematics. Read "Origins Revisited", even today experienced people cooperate in complex tasks without much or no spoken language use.