Obama proposes brain mapping project
2 April 2013 Last updated at 22:39 BST
US President Barack Obama has unveiled a new initiative to map the brain.
Speaking at the White House, he announced an initial $100m investment to shed light on how the brain works and provide insight into diseases such as Alzheimer's and epilepsy.
President Obama said understanding what he called "the three pounds of matter that sits between our ears" was on a par with the human genome project.