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Right-handedness prevailed 500,000 years ago

Date:
April 20, 2011
Source:
University of Kansas
Summary:
Markings on fossilized front teeth show that right-handedness goes back a half-million years in the human family.

New research shows that distinctive markings on fossilized teeth correlate to the right or left-handedness of individual prehistoric humans.
Credit: Image courtesy of University of Kansas

Right-handedness is a distinctively human characteristic, with right-handers outnumbering lefties nine-to-one. But how far back does right-handedness reach in the human story? Researchers have tried to determine the answer by looking at ancient tools, prehistoric art and human bones, but the results have not been definitive.

Now, David Frayer, professor of anthropology at the University of Kansas, has used markings on fossilized front teeth to show that right-handedness goes back more than 500,000 years. He is the lead author (with colleagues in Croatia, Italy and Spain) of a paper published this month in the British journal Laterality.

His research shows that distinctive markings on fossilized teeth correlate to the right or left-handedness of individual prehistoric humans.

"The patterns seen on the fossil teeth are directly and consistently produced by right or left hand manipulation in experimental work," Frayer said.

The oldest teeth come from a more than 500,000-year-old chamber known as Sima de los Huesos near Burgos, Spain, containing the remains of humans believed to be ancestors of European Neandertals. Other teeth studied by Frayer come from later Neandertal populations in Europe.

"These marks were produced when a stone tool was accidentally dragged across the labial face in an activity performed at the front of the mouth," said Frayer. "The heavy scoring on some of the teeth indicates the marks were produced over the lifetime of the individual and are not the result of a single cutting episode."

Overall, Frayer and his co-authors found right-handedness in 93.1 percent of individuals sampled from the Sima de los Huesos and European Neandertal sites.

"It is difficult to interpret these fossil data in any way other than that laterality was established early in European fossil record and continued through the Neandertals," said Frayer. "This establishes that handedness is found in more than just recent Homo sapiens."

Frayer said that his findings on right-handedness have implications for understanding the language capacity of ancient populations, because language is primarily located on the left side of the brain, which controls the right side of the body, there is a right handedness-language connection.

"The general correlation between handedness and brain laterality shows that human brains were lateralized in a 'modern' way by at least half a million years ago and the pattern has not changed since then," he said. "There is no reason to suspect this pattern does not extend deeper into the past and that language has ancient, not recent, roots."


Story Source:

The above story is based on materials provided by University of Kansas. Note: Materials may be edited for content and length.


Journal Reference:

  1. David Frayer, Marina Lozano, Jose Bermudez de Castro, Eudald Carbonell, Juan Luis Arsuaga, Jakov Radovcic, Ivana Fiore, Luca Bondioli. More than 500,000 years of right-handedness in Europe. Laterality: Asymmetries of Body, Brain and Cognition, 2011; 1 DOI: 10.1080/1357650X.2010.529451

Cite This Page:

University of Kansas. "Right-handedness prevailed 500,000 years ago." ScienceDaily. ScienceDaily, 20 April 2011. <www.sciencedaily.com/releases/2011/04/110419131543.htm>.
University of Kansas. (2011, April 20). Right-handedness prevailed 500,000 years ago. ScienceDaily. Retrieved October 23, 2014 from www.sciencedaily.com/releases/2011/04/110419131543.htm
University of Kansas. "Right-handedness prevailed 500,000 years ago." ScienceDaily. www.sciencedaily.com/releases/2011/04/110419131543.htm (accessed October 23, 2014).

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