People are less likely to be selfish if they feel they are being watched,
which has huge implications for real life," Bateson said. "For example,
this could be applied to warnings about speed cameras.
A sign bearing an image of a camera is less effective because it has to be actively processed by our brains. Our research, along with previous studies, suggests drivers would react much more quickly and positively to signs that display natural stimuli such as eyes and faces.