There is a huge gap between what we think controls our behaviour and what really does, argues neuroscientist Roeland Dietvorst. That is because the human brain consists of two ‘systems’: a ‘reptilian brain’ that has evolved over millions of years and a much younger ‘rational brain’. Dietvorst uses a number of experiments to demonstrate that many of our supposedly ‘rational’ decisions are taken in our subconscious ancient brain. And that the reward centre in the brain can even induce us to engage in rationally irresponsible behaviour like whatsapping while driving. Watch this inspiring TEDx talk here: