Navigation Links
Big brains arose twice in higher primates
Date:7/9/2008

After taking a fresh look at an old fossil, John Flynn, Frick Curator of Paleontology at the American Museum of Natural History, and colleagues determined that the brains of the ancestors of modern Neotropical primates were as small as those of their early fossil simian counterparts in the Old World. This means one of the hallmarks of primate biology, increased brain size, arose independently in isolated groupsthe platyrrhines of the Americas and the catarrhines of Africa and Eurasia.

"Primatologists have long suspected that increased encephalization may have arisen at different points in the primate evolutionary tree, but this is the first clear demonstration of independent brain size increase in New and Old World anthropoids," says Flynn of the paper that appeared in the Museum's publication Novitates this June. Encephalization is the increase in brain size relative to body size. Animals with large encephalization quotients (E.Q.'s) are those with bigger brains relative to their body size in comparison to the average for an entire group. Most primates and dolphins have high E.Q.'s relative to other mammals, although some primates (especially apes and humans) have higher E.Q.'s than others.

At the heart of the new paper is the development of more accurate equations for estimating body size in platyrrhines, or New World "monkeys." Most fossils are fragments of skulls or teeth so, to help in estimating their body size (and then E.Q.), Flynn and colleagues collected 80 measurements of the skulls, jaws, and teeth of 17 different species of living New World monkeys that ranged across the full spectrum of body sizes. This study is one of the first to estimate body size with platyrrhines instead of their better-studied counterparts from the Old World, and this detailed analysis uses new statistical approaches to tease out which characteristics correlate best with body size. The goal is to apply this equation to fossilized specimens.


'/>"/>
Contact: Kristin Phillips
kphillips@amnh.org
212-496-3419
American Museum of Natural History
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Doctors learn to control their own brains pain responses to better treat patients
2. From brains to behavior: Cold Spring Harbor Protocols features methods for neuroscience research
3. Brains R Us: Neuroscience and education town hall
4. Girls who begin dieting twice as likely to start smoking
5. Risk of common vaginal infection linked to preterm birth appears higher for blacks
6. Improved e-jet printing provides higher resolution and more versatility
7. Low vitamin D linked to higher risk of hip fracture
8. Engineers study brain folding in higher mammals
9. Less Arctic ice means higher risks, experts warn
10. Obesity-related hormone is higher in children with Down syndrome
11. Insects take a bigger bite out of plants in a higher CO2 world
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Big brains arose twice in higher primates
(Date:12/17/2014)... Dec. 15, 2014 The Defense Logistics ... easier to detect and prevent counterfeit microcircuits from ... the agency started performing an in-house microcircuit anti-counterfeit ... the authenticity of purchased microcircuits while increasing their ... control measures will be conducted at DLA,s Electronics ...
(Date:12/17/2014)... , Dec. 16, 2014 Research and Markets ... addition of the "Global Chemical Sensor Market ... http://photos.prnewswire.com/prnh/20130307/600769 One ... increasing demand for medical sensors in biomedical applications. ... for quick and correct diagnosis during surgical procedures. ...
(Date:12/11/2014)... Research and Markets , ... http://www.researchandmarkets.com/research/twhjll/biometrics_market ) has announced the addition of the ...  report to their offering. One ... in technology. With continuous advances in technology, it ... latest standard that meets the needs and expectations ...
Breaking Biology News(10 mins):Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 2Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 3Global Chemical Sensor Market 2015-2019: Key Vendors are Abbott Laboratories, Bayer, Hoffmann La-Roche, Johnson & Johnson, NGK Spark Plugs and Robert Bosch 2Biometrics Market in the APAC Region 2015-2019: Key Vendors are 3M Cogent, NEC, Safran and Suprema 2
... herd of mouflon for sport hunting on a remote island ... a laboratory for genetic researchers and led to a surprising ... from a single male and female pair transplanted to Haute ... of its founding parents. This finding challenges the widely accepted ...
... a short-chain fatty acid compound, Johns Hopkins researchers have ... in lab tests. The researchers cautioned that their double-punch ... Chemistry & Biology, has not yet been tested on ... promising new strategy for fighting the deadly disease. ...
... America announced today its plans to launch a new ... of women with advanced stage ovarian cancer. This innovative ... America and developed by AVAX Technologies, Inc. (OTCMarket: AVXT.OB). ... priority is to help our patients win the battle ...
Cached Biology News:Remote sheep population resists genetic drift 2Hybrid molecule causes cancer cells to self-destruct 2Hybrid molecule causes cancer cells to self-destruct 3
(Date:12/17/2014)... Dec. 17, 2014 CASI Pharmaceuticals, Inc. (Nasdaq: ... the acquisition, development and commercialization of innovative therapeutics addressing ... market with a primary commercial focus on ... granted a Type C meeting with the U.S. Food ... be held in February 2015.  During this meeting the ...
(Date:12/17/2014)... 2014   Synageva BioPharma Corp. (NASDAQ: ... for rare disorders, announced today its presentation at the ... San Francisco, CA. ... will present on Monday, January 12, 2015, at 9:00 ... webcast live and may be accessed from the "Webcasts ...
(Date:12/15/2014)... TIKVAH, Israel , Dec. 15, 2014 ... ), a leading developer of adult stem cell technologies ... Cell Therapeutics Ltd. was awarded a grant of approximately ... of the Chief Scientist (OCS).  This is the eighth ... support from the Office of the Chief Scientist, which ...
(Date:12/15/2014)...  GlassesOff Inc. (OTCBB: GLSO) announced today the appointment ... director of the Company,s Board of Directors. ... its CEO until its acquisition by Stanley Black ... Recognized as the inventor of the first Wi-Fi-based Active ... -based RFID solutions focused on improving operational efficiency, safety ...
Breaking Biology Technology:CASI Pharmaceuticals Granted Type C Meeting With U.S. FDA For ENMD-2076 In Fibrolamellar Carcinoma 2CASI Pharmaceuticals Granted Type C Meeting With U.S. FDA For ENMD-2076 In Fibrolamellar Carcinoma 3CASI Pharmaceuticals Granted Type C Meeting With U.S. FDA For ENMD-2076 In Fibrolamellar Carcinoma 4CASI Pharmaceuticals Granted Type C Meeting With U.S. FDA For ENMD-2076 In Fibrolamellar Carcinoma 5BrainStorm Receives $1,100,000 for its 8th Annual Non-Dilutive Grant from Israel's Chief Scientist Office 2BrainStorm Receives $1,100,000 for its 8th Annual Non-Dilutive Grant from Israel's Chief Scientist Office 3AeroScout Founder Joins GlassesOff's Board of Directors 2AeroScout Founder Joins GlassesOff's Board of Directors 3
... believes his life-science company, GenTel BioSciences , has taken ... platform from GlaxoSmithKline , but just how major could ... quality of data GenTel delivers to customers. , ,GenTel, ... announced the acquisition during an open house at its new ...
... has simplified local and national radio advertising for small business ... Ads network includes hundreds of radio stations across the United ... create a radio ad? , ,For one thing, more accessible ... with both terrestrial and satellite radio stations across the U.S. ...
... that probably went unnoticed outside the academic world, the ... that show why the rest of us should be ... research. The numbers demonstrate that investment in research is ... creating jobs for the 21st century economy. , ,The ...
Cached Biology Technology:GenTel acquires GlaxoSmithKline chip platform 2GenTel acquires GlaxoSmithKline chip platform 3See how they run: Radio ads and Google 2See how they run: Radio ads and Google 3See how they run: Radio ads and Google 4Tapping hidden assets: Wisconsin researchers who can create jobs 2Tapping hidden assets: Wisconsin researchers who can create jobs 3Tapping hidden assets: Wisconsin researchers who can create jobs 4