Population Density Triggered Rapid Growth of Human Brain Over Past 2 Million Years


	Population Density Triggered Rapid Growth of Human Brain Over Past 2 Million Years

einbar

7-1-2009 11:16 AM

352 views

Add a Comment

Login to Comment. Not a member yet? Sign up

Today's Top Clips

visit the Top Clips page

View the Top Clips from July 1, 2009

Embed This Clip In Your Site...

<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/888af625-a989-45af-a320-1d98932e97db/474F60D4-B034-4B2C-8BCA-526637282CF8/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html" href="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html" style="font-size: 11px;">www.dailygalaxy.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html"><H3 class="entry-header"><A href="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html">Population Density Triggered Rapid Growth of Human Brain Over Past 2 Million Years</A></H3></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.dailygalaxy.com/img/5A44759E-1455-4709-87DA-1DB302299705" alt="6a00d8341bf7f753ef0115704d8b7c970c-500wi" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html">For the past 2 million years, the size of the human brain has tripled, growing much faster than other mammals</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html">niversity of Missouri researchers studied three common hypotheses for brain growth: climate change, ecological demands and social competition</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html">The team found that social competition is the major cause of increased cranial capacity.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html">Our findings suggest brain size increases the most in areas with larger populations and this almost certainly increased the intensity of social competition</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html">When humans had to compete for necessities and social status, which allowed better access to these necessities, bigger brains provided an advantage</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.dailygalaxy.com/my_weblog/2009/06/population-density-triggered-rapid-growth-of-human-brain-over-past-2-million-years.html">"Brains are metabolically expensive, meaning they take lots of time and energy to develop and maintain, making it so important to understand why our brains continued to evolve faster than other animals</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/474F60D4-B034-4B2C-8BCA-526637282CF8/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

Clipmarks: Home; New Clips; Top Clips; Dashboard

Popular Topics: News; Life; Science; Technology; Entertainment

Get Started: Sign Up; Install Clipping Tool; How Clipping Works; Clip-to-Blog™; ClipSearch

Tools and Resources: FAQ; ClipWeek; Top Clippers; Top Tags; Site Map

About Clipmarks: About Us; Contact; Blog; Copyright; Privacy; EULA

Search Options

Today's Top Clips