Psychologist Kimberley Wilson and Dr Xand van Tulleken take a journey around the human body, to find out what it can tell us about our innate capacity for change. To finish this series, they're in the brain getting acquainted with the amygdala.

Is the amygdala really the home of fear? Kimberley and Xand meet someone who has had theirs removed, discovering the true nature of this part of the brain, and how it can give us a roadmap to dealing with our everyday anxieties.

Producer: Georgia MillsMixer: Tom Brignell Researcher: Leonie ThomasExecutive Producer: Robert NicholsonA Whistledown production for BBC Radio 4