Roses are red, violets are blue but according to the latest understanding these colours are really an illusion. One that you create yourself. Horizon reveals a surprising truth about how we all see the world. You may think a rose is red, the sky is blue and the grass is green, but it now seems that the colours you see may not always be the same as the colours I see. Your age, sex and even mood can affect how you experience colours. Scientists have unlocked the hidden power that colours can have over your life - how red can make you a winner, how blue makes time speed up, and more.
Have you noticed how the full moon looks bigger on the horizon than high overhead? Actually, the two images are exactly the same size -- so why do we perceive them differently? Scientists aren't sure, but there are plenty of intriguing theories. Andrew Vanden Heuvel unravels the details of focus, distance and proportion that contribute to this mystifying optical illusion.
How much of the sensations we feel is determined by our physical bodies? Maybe our minds play a bigger role than we know. I’ll see if people can be tricked into feeling intense physical pain, even though it’s all in their heads. I’ll also look at a machine that makes it possible for you to tickle yourself, and I’ll show you a weird physical illusion you can do at home.
Dr Michael Mosley and Professor Alice Roberts investigate if male and female brains really are wired differently. New research suggests that the connections in men and women's brains follow different patterns, patterns which may explain typical forms of male and female behaviour. But are these patterns innate, or are they shaped by the world around us? Using a team of human lab rats and a troop of barbary monkeys, Michael and Alice test the science and challenge old stereotypes. They ask whether this new scientific research will benefit both men and women - or whether it could drive the sexes even further apart.
Do psychedelic drugs really bring about self-healing and personal enlightenment? New research says they may. In this episode, I travel to the Amazonian jungle of Peru to experience the mind-expanding effects of the psychedelic brew Ayahuasca.