Subscribe free to our newsletters via your
. Earth Science News .




ABOUT US
How to find out about the human mind through stone
by Staff Writers
Basque Country, Spain (SPX) Sep 25, 2015


File image.

Laterality is the preference of human beings for one side of our bodies; being left-handed or right-handed, for example, or having a preference for using one eye or ear or the other. In the view of the geologist and primatologist Eder Dominguez-Ballesteros, "lateralised behaviour in humans may in some way have been reflected in their technological products, in particular, in the things they made.

Besides, flint knapping -inherent in our genus since the first stages in its evolution- is an excellent source of information for studying lateralization in humans".

The research was conducted in the following way: "The flakes, which could be the result of lithic knapping, remains..., or the "anvil" for making an artefact, have been analysed. We focus on the butt of the flake which is where part of the percussion platform has been preserved.

The fractures that appear on the platform are oriented according to the direction of the impact made on it by the percussor. Once the direction of the impact is known, it is possible, with a high degree of reliability, to determine whether it was produced by the left hand or the right hand," explained Dominguez-Ballesteros.

"To hit the core on the same spot, a knapper, whether left-handed or right-handed, has to turn it to position it on one side of him or on the other. The angle at which the blow is made with both the right-handed and the left-handed percussor would be the same, but in exactly the opposite direction," said the researcher, who went on to say: "The core is the fragment of raw material from which the flakes are removed, and the percussion platform, the surface on which the core is struck".

One flint flake, one knapper
The first pieces of work oriented towards determining human laterality through flint flakes -the product of the flint knapping of our ancestors- were made by Toth in 1985. According to this researcher, while the flint flakes were being removed, a right-handed knapper would turn the core in a clockwise direction, while a left-handed one would do so in the opposite, anti-clockwise direction.

However, subsequent pieces of research (Patterson and Sollberg) showed that a left-handed knapper could produce a certain number of right-handed flakes, and vice versa.

Later, Rugg and Mullane studied the orientation of the percussion cone of the flint flake and linked it with the direction of the percussion angle; yet Bargallo and Mosquera showed that the Rugg and Mullane method alone does not allow the knapper's laterality to be determined.

In the end, Dominguez-Ballesteros and Alvaro Arrizabalaga came up with a method allowing each individual flint flake to be linked to the laterality of the knapper who produced it, without any need to have available a number of flakes produced by the same knapper. So it is an extensive method that can be applied across various periods of the archaeological record.

E. Dominguez-Ballesteros, A. Arrizabalaga, 2014. Laterality in the first Neolithic and Chalcolithic farming communities in northern Iberia. Laterality, 20, 371-387. doi:10.1080/1357650X.2014.982130; E. Dominguez-Ballesteros, , A. Arrizabalaga, 2015. Flint knapping and determination of human handedness. Methodological proposal with quantifiable results. The Journal of Archaeological Science. doi:10.1016/j.jasrep.2015.06.026


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

.


Related Links
University of the Basque Country
All About Human Beings and How We Got To Be Here






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





ABOUT US
Scientists report earlier date of shift in human ancestors' diet
Baltimore MD (SPX) Sep 16, 2015
Millions of years ago, our primate ancestors turned from trees and shrubs to search for food on the ground. In human evolution, that has made all the difference. The shift toward a grass-based diet marked a significant step toward the diverse eating habits that became a key human characteristic, and would have made these early humans more mobile and adaptable to their environment. Ne ... read more


ABOUT US
Clean-up of toxic pool in Tianjin complete: Xinhua

Dutch team launches free 'Airbnb' site for refugees

Hungarian army given sweeping powers against migrants

Over 190 hurt when fire drill goes wrong in China

ABOUT US
Laser pulses for ultrahigh molecular sensitivity, in Nature Photonics

4-D technology allows self-folding of complex objects

Atomic fractals in metallic glasses

Laser ablation boosts terahertz emission

ABOUT US
Research uncovers microsopic key to reducing ocean dead zones

Is climate change killing American starfish?

A new analysis and approach to watershed management

Blue crabs more tolerant of low oxygen than previously thought

ABOUT US
Melting Arctic sea ice accelerates methane emissions

Adaptation to high-fat diet, cold had profound effect on Inuit, including shorter height

Solving the problem of sea ice thickness distribution using molecular concepts

Burning remaining fossil fuel could cause 60-meter sea level rise

ABOUT US
Horse owners can battle flies with wasps, not pesticides

UK food recycling cafes go global in fight against waste

Variety the spice of life for Mumbai's tiffin carriers

Harvesting clues to GMO dilemmas from China's soybean fields

ABOUT US
Volcano erupts in Nicaragua

Are we wiser about tsunamis? Expert says yes and no

At least 10 killed in Iran flash flooding: state TV

One-two punch of rising seas, bigger storms may greatly magnify US East coast floods

ABOUT US
Burkina president resumes power after week-long coup

Nigeria claims rescue of 241 women, girls from Boko Haram

Burkina coup leaders warn they will hit back if attacked

DR Congo: is rebellion the royal road to power?

ABOUT US
Targeted Electrical Stimulation of the Brain Shows Promise as a Memory Aid

Scientists report earlier date of shift in human ancestors' diet

Fossil trove adds a new limb to human family tree

Bonobos use finger-pointing, hand gestures to communicate




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.