Liz talks to Prof. John Onians from the School of World Art Studies at the University of East Anglier - the first neuro-art historian in history. He shares his theory for how neuroscience solves some of the major art history mysteries. Why were the prehistoric cave drawings more life-like than drawings for thousands of years to come? Why does the style of painting change from era to era when the world looks much the same? How do our brains shape our art? What makes an artists brain different from a lawyer's, a banker's or a scientist's? Neuroscience goes places where art history has never had access before and both disciplines are richer for the meeting.