we're looking to see if a brief cognitive task shortly after a traumatic event can target specifically intrusive memories of flashbacks and whether that can prevent a development not only of those distressing symptoms in and of themselves, but other psychological problems. as night falls in edinburgh, each lantern for each life lost shines bright. more than 300 people are taking part in tonight's walk. there's been so much love here, lots of tears as well, silence at times, but also laughter and most of all, there's been acknowledgement, recognition of these precious lives that have been lost. for kellie, this walk is part of her healing process. i feel he's with me when i come to these, i feel close to him. i know he's with me every day, but these events make it more real. kellie remembers her son every day, but she still doesn't know why her baby died. in fact, most people never get a definitive