Subscribe to France 24 now: http://f24.my/youtubeEN FRANCE 24 live news stream: all the latest news 24/7 http://f24.my/YTliveEN The human brain is often thought of as the body's super-computer, controlling our perception of the world and our actions within it. Why, then, are our brains separated into two distinct hemispheres, ultimately taking up more energy than seems necessary? And how do the two sides work together to inform our perception of the world? We speak to neuropsychologist and author Iain McGilchrist about our divided brains. Visit our website: http://www.france24.com Subscribe to our YouTube channel: http://f24.my/youtubeEN Like us on Facebook: https://www.facebook.com/FRANCE24.English Follow us on Twitter: https://twitter.com/France24_en