The theme of the Cheltenham Festival of Science, which runs from 9-13 June, is perception. How do we understand the world around us? Exactly how are animal minds different from ours? And what really is happening in the brains of adolescents? Quentin Cooper is joined by neuroscientist Sarah Jayne Blakemore to find out why the passage to adulthood is such a turbulent time. He is also joined by Colin Blakemore and Keith Kendnck to find out about human and animal perception and whetherwe can ever really understand animal minds. producer Pamela Rutherford