What makes us who we are? In Radio 4's discussion programme to start off the week, Tom Sutcliffe and guests explore consciousness and identity, and whether the face reveals our inner thoughts and character.

American science writer Michael Pollan is celebrated for his work on food and psychedelic drugs. His new book A World Appears, is a sweeping investigation into consciousness - examining where our sense of self comes from, how it is experienced across species, and what new theories from neuroscience, philosophy and plant biology reveal about awareness.

Cultural historian Fay Bound-Alberti traces the long, complex history of the human face, showing how it has been used to define identity, moral character and social status, and how new technologies – from photography to facial recognition – shape our understanding of selfhood in the modern world.

Mary Costello’s latest novel A Beautiful Loan, focuses on the life of Anna Hughes, a woman looking back across decades of love, loss and betrayal as she tries to understand the choices that shaped her and the deeper self she learns, slowly, to claim.

Producer: Katy Hickman