Eyes offer window into brain’s timekeepers

In monkeys, pupil size linked to perception of milliseconds

a Japanese macaque

EYE-OPENING  Pupil size could predict whether Japanese macaques would over- or underestimate a second, a new study of lab monkeys shows.

Yiannis Theologos Michellis/Flickr (CC B-SA 2.0)

The eyes may reveal whether the brain’s internal stopwatch runs fast or slow.