Scientists previously thought the eye was used to watch out for predators above, but we’ve since learned that the creature can’t actually see out of it. It’s called the parietal eye ...

Iguanas. Native to Central and South America, iguanas are a unique group of reptiles known for possessing a third "parietal" eye. Unlike their two primary eyes, which provide clear vision ...

Associations seen between less short wave sleep and rapid eye movement sleep with smaller inferior parietal region volumes.