Navigation Links
Humans Weren't Always 'So Special,' Expert Says
Date:6/25/2009

Finding suggests that brain took millions of years to evolve

THURSDAY, June 25 (HealthDay News) -- A 54-million-year-old skull has yielded the first detailed images of a primitive primate brain.

The 1.5-inch-long skull was from an animal species called Ignacius graybullianus, part of a group of primates known as plesiadapiforms. They evolved in the 10 million years after dinosaurs disappeared from the Earth.

Researchers used CT scans to take more than 1,200 cross-sectional images of the skull and combined them into a three-dimensional model of the brain.

"Most explanations on the evolution of primate brains are based on data from living primates," Mary Silcox, an anthropologist at the University of Winnipeg in Canada and a research associate at the Florida Museum of Natural History at the University of Florida, said in a school news release.

"There have been all these inferences about what the brains of the earliest primates would look like, and it turns out that most of those inferences are wrong," she said.

Ignacius graybullianus was similar to modern primates in terms of diet and tree-dwelling, the researchers report, but its brain was one-half to two-thirds the size of the brain of the smallest modern primates. This suggests that fruit-eating and tree-dwelling, for instance, weren't factors in the evolution of larger brain sizes in primates because "the smaller-brained Ignacius was already doing those things," said Silcox, lead author of a report on the findings, which were published in this week's online issue of the Proceedings of the National Academy of Sciences.

Co-author Jonathan Bloch, a vertebrate paleontologist at the Florida Museum of Natural History, said that "a large and complex brain has long been regarded as one of the major steps that sets primates apart from the rest of mammals."

But at humans' "very humble beginnings, we weren't so special," he said. "That happened over tens of millions of years."

More information

Your Amazing Brain has more about human brain evolution.



-- Robert Preidt



SOURCE: University of Florida, news release, June 22, 2009


'/>"/>
Copyright©2009 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Investigational Agent Targeting Metabotropic Glutamate 2/3 Receptors Demonstrates Antipsychotic Activity in Humans, Study in Nature Medicine Finds
2. Toddler Study Proves Humans Outsmart Apes
3. ABC TV San Francisco Features Canine Cancer Research Story: Saving Our Dogs, Helping Humans Beat Cancer - Work at Morris Animal Foundation, UC-Davis
4. FDA approves knee-injury device for humans
5. Grape Consumption Improves Antioxidant Capacity in Humans
6. Cross-species transplant in rhesus macaques is step toward diabetes cure for humans
7. Not just humans benefit from animal biotechnology
8. Modest gain in visceral fat causes dysfunction of blood vessel lining in lean, healthy humans
9. CDC Reports Prevalence of Worms Transmitted by Dogs and Cats to Humans is Higher Than Previously Understood
10. Chimps Top Humans in Number Recall
11. Menopause May Be Unique to Humans
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Humans Weren't Always 'So Special,' Expert Says
(Date:6/24/2016)... CA (PRWEB) , ... June 24, 2016 , ... ... is now offering micro-osteoperforation for accelerated orthodontic treatment. Dr. Cheng has extensive experience ... Damon brackets , AcceleDent, and accelerated osteogenic orthodontics. , Micro-osteoperforation is ...
(Date:6/24/2016)... , ... June 24, 2016 , ... Topical BioMedics, Inc, makers of Topricin and MyPainAway ... call for a minimum wage raise to $12 an hour by 2020 and then adjusting ... restore the lost value of the minimum wage, assure the wage floor does not erode ...
(Date:6/24/2016)... ... 2016 , ... EB Medicine presented its first-ever “Issue of ... in Ponte Vedra Beach, FL. The awards honor the outstanding work of leading ... and Pediatric Emergency Medicine Practice. , “With this award, we recognize the efforts ...
(Date:6/24/2016)... (PRWEB) , ... June 24, 2016 , ... ... client, The Grove Investment Group (TGIG), has initiated cultivation and processing operations at ... Las Vegas and Pahrump, Nevada. , Puradigm is the manufacturer of a complete ...
(Date:6/24/2016)... ... ... National recruitment firm Slone Partners is pleased to announce the placement ... Vice President of North American Capital Sales at HTG Molecular . ... in the commercialization of the HTG EdgeSeq system and associated reagents in North America. ...
Breaking Medicine News(10 mins):
(Date:6/26/2016)...  VMS Rehab Systems, Inc. ( www.vmsrehabsystemsinc.com ) reported ... required to build a strong and stable market for ... on the OTC Markets-pink current trading platform. ... are seeing an anomaly in market trading activities that ... the Company, but shareholders and market players as well. ...
(Date:6/24/2016)... , June 24, 2016  Global Blood ... biopharmaceutical company developing novel therapeutics for the treatment ... today announced the closing of its previously announced ... stock, at the public offering price of $18.75 ... offering were offered by GBT. GBT estimates net ...
(Date:6/24/2016)... , June 24, 2016 The Academy of ... recommendations that would allow biopharmaceutical companies to ... entities that make formulary and coverage decisions, a move ... of new medicines. The recommendations address restrictions ... appear on the drug label, a prohibition that hinders ...
Breaking Medicine Technology: