Tom Sutcliffe talks to the neuroscientist Dick Swaab who argues that everything we do and don't do is determined by our brain. He explains why 'we are our brains'. The philosopher Julian Baggini doesn't dispute the pre-eminence of brain processes but believes it doesn't tell the whole story. As a writer Helen Dunmore must get into the minds of her characters - the latest a war-damaged soldier from the trenches. Natalie Abrahami only has the heads of her characters to play with as she directs Samuel Beckett's Happy Days about the amazing ability of a woman to survive by denying her ever-diminishing world.