Program:More from CaliphateTerrorism, Islam, Psychology, NeuroscienceTranscriptPresenter: Alice BrennanReporter: Rukmini CallimachiProducer: Andy MillsSound Engineer: Jen ParsonageFull Episode PlayingCaliphate chapters four and fiveIn this episodeChapter 4: Us vs ThemDuration: 25 minutes 23 seconds25m Chapter 5: The HeartDuration: 21 minutes 3 seconds21m The psychology of radicalisationDuration: 11 minutes 16 seconds11m