See related story: Just How Exciting Is It?
Slideshow: Just How Exciting Is It?
A British designer is working on a system to measure excitement. The data he's gathering could be used to modify games in real time to enhance players' experiences. By Rowan Hooper.
A photograph captures the point of maximum arousal during a fairground ride. The image is of a volunteer wearing the auto-portrait machine.Courtesy of Brendan Walker

