It turns out that much of what we do – much of our behaviour – can be conducted at an unconscious level. That raises a profound question. What is the point of consciousness? What evolutionary advantage does consciousness bestow? We speak to psychologists and neuroscientists for the answer. And we ask a philosopher whether science can ever unravel the deep mysteries of consciousness. The programme is guaranteed to hurt your brain.

Presenter and producer: David Edmonds Editor: Richard Knight

(Photo: / Credit: Doorway to another world - stock photo. Getty Images)