The Asahi phantasm methods people and rats
Laeng et al
An optical phantasm that performs with our notion of brightness additionally appears to work on rats, suggesting that the connection between notion and pupil dimension advanced early on in mammals.
The Asahi phantasm is made up of a sequence of petal-like shapes surrounding a white centre. The petals are yellow near the centre, transitioning to black on the edges, and this gradient, mixed with the form of the petals, makes it appear as if the white centre is brighter than it really is. …
Source: www.newscientist.com