"Not so much a fear of going out as a fear of something dreadful happening whilst being out" - writer Graham Caveney talks to Matthew Sweet about his own experience of agoraphobia and also how the condition has been reflected in the work of other writers, including Shirley Jackson and Emily Dickinson. Writer Kate Summerscale and New Generation Thinker Joan Passey trace the shifting ideas about sources of phobias in the 19th century and the explosion of interest in naming and cataloguing them. Film critic Christina Newland explores Alfred Hitchcock's portrayal of phobias in films including Frenzy and Marnie. Graham Caveney's book 'On Agoraphobia' is available now. Kate Summerscale is the author of 'The Book of Phobias and Manias'. Producer: Torquil MacLeod