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:10/13/2017)... QUEENS, N.Y (PRWEB) , ... October 13, 2017 , ... ... recently became a member of ElderCounsel, a national organization of elder law and special ... constantly changing laws and rules. It also provides a forum to network with elder ...
(Date:10/13/2017)... LUIS OBISPO, Calif. (PRWEB) , ... October 13, 2017 , ... ... Alzheimer’s or dementia. However, many long-term care insurance companies have a waiver for care ... is the 90-day elimination period, when the family pays for care, is often waived, ...
(Date:10/13/2017)... ... October 13, 2017 , ... Ellevate Network, the leading network for ... for action towards gender equality at their inaugural Summit in New York City in ... reached a social audience of over 3 million. To watch the Mobilize Women video, ...
(Date:10/13/2017)... ... October 13, 2017 , ... Yisrayl Hawkins, Pastor and Overseer at ... of the most popular and least understood books in the Holy Scriptures, Revelation. The ... that have baffled scholars for centuries. Many have tossed it off as mere rubbish, ...
(Date:10/13/2017)... (PRWEB) , ... October 13, 2017 , ... ... DevOps and Agile Software Development, has been awarded a contract by the Center ... Purchase Agreement (BPA) aims to accelerate the enterprise use of Agile methodologies in ...
Breaking Medicine News(10 mins):
(Date:10/11/2017)... Oct. 11, 2017  BioPharmX Corporation (NYSE MKT: BPMX) ... developed an innovative way to use nonlinear optical imaging ... of new drugs. ... Conference will show how researchers from BioPharmX and the ... School used a suite of imaging techniques in what ...
(Date:10/11/2017)... , Oct. 11, 2017  True Health, a ... amplified its effort during National Breast Cancer Awareness ... cancer risks. ... Oncology calculated that more than 10 million American ... mutations in BRCA1 or BRCA2 and have not had ...
(Date:10/10/2017)... , Oct. 10, 2017  NDS received FDA 510(k) clearance ... a medical-grade battery-powered display stand specifically designed for endoscopy environments. An ... technology into a clinical solution to support the improvement of patient ... Innovative Design ... Wireless Solution ...
Breaking Medicine Technology: