Why your memories can't be trusted – video

Memory does not work like a video tape - it is not stored like a file just waiting to be retrieved. Instead, memories are formed in networks across the brain and every time they are recalled they can be subtly changed. So if these memories are changeable, how much should we trust them? With experts Dr Julia Shaw and Prof Elizabeth Loftus, the Guardian's Max Sanderson explores the mysterious world of human memory, how false memories can be implanted - and how this can be harnessed for good and ill