The Pupil in Your Eye Can Perceive Numerical Information, Not Just Light - ScienceAlert
Oct 27, 2021 40 secs
You might know that the size of the pupils in our eyes changes depending on how well lit our environment is, but there's more to the story: Scientists have now discovered that the pupil also shifts in size depending on how many objects we're observing.

The more objects in a scene, the bigger the pupil grows, as if to better accommodate everything that it has to look at.

The researchers are keen to dig further into why this is happening, and what else could be having an impact on pupil size – such as the movement required by the eye to take in everything that appears in a scene.

"Recent research from our laboratory shows that pupil size is also regulated by cognitive and perceptual factors," says physiologist Paola Binda from the University of Pisa in Italy


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