Professor Bruce Hood shows an audience an images which changes with every blink, yet the audience fail to see big changes such as a disappearing tree and car. This is called change blindness. Everytime your eye blinks, your brain doesn't notice anything different unless you're paying special attention. The brain is regulating our behaviour by telling us what we have to pay attention to, it controls what we learn and how we remember. This clip is part of the Christmas Lectures 2011 presented by Professor Bruce Hood - Lecture Two: Who's in charge here anyway? The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter