By Emma Young
One eyewitness to a robbery reports that the culprit was a male in his 40s with brown hair, wearing a light-coloured T-shirt. Another describes a blond man in his early 30s wearing a denim shirt. If you’re a police officer investigating the crime, whose memory do you trust?
Identifying which of two apparently credible but conflicting eye-witness statements to trust is a big problem for law enforcement agencies (as is deciding, in the case of a witness who has no incentive to lie, which among their memories are accurate). Now a new paper, reported in the Journal of Experimental Psychology, provides initial evidence for a new, objectively verifiable method for doing this. This work has, as the researchers write, “potentially far-reaching significance, not the least in the legal context.”