It is currently Sat Dec 16, 2017 7:53 am



Post new topic Reply to topic  [ 1 post ] 
 New research suggests right-handedness prevailed 500,000 yea 
Author Message
Site Admin
User avatar

Joined: Sun Oct 11, 2009 8:59 am
Posts: 6532
Location: Friendswood, TX
Post New research suggests right-handedness prevailed 500,000 yea
LAWRENCE — 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?

snip

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.

snip

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.” :mrgreen:

Read more here: http://www.news.ku.edu/2011/april/18/righthanded.shtml

_________________
The test of our progress is not whether we add more to the abundance of those who have much; it is whether we provide enough for those who have too little. - FDR


Wed Apr 20, 2011 11:31 am
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by Vjacheslav Trushkin for Free Forums/DivisionCore.