Stare deep into the eyes of a sheep and you’ll probably upset a farmer, but before the guns start waving you might notice ...

Unequal pupils (anisocoria) may be a sign of a medical issue. Certain medications placed in the eyes can cause the pupils to ...

Summary: Researchers have discovered that pupil size during non-REM sleep correlates with memory consolidation. When pupils ...

Larger pupils and brighter irises in primate portraits elicited more positive impressions and greater donations, highlighting ...

Nocturnal animals tend to have proportionally bigger eyes than humans do. They also tend to have pupils that open more widely in low light. So, at the outset, nocturnal eyes gather more light than ...

Researchers have found the pupil is key to understanding how, and when, the brain forms strong, long-lasting memories.

Pupillometry measures the size and reactivity of the pupil, the dark circle at the eye’s centre through which light enters. Typically, the pupil contracts and dilates depending on the amount of ...

A contracted pupil during sleep may be an indication the brain is replaying new memories while a dilated one may hint at ...

By studying mice equipped with brain electrodes and tiny eye-tracking cameras, the researchers determined that new memories are being replayed and consolidated when the pupil is contracted during ...

Researchers at Cornell University in the US attached electrodes to mice brains and followed the rodents with eye-tracking cameras. They found new memories replayed and consolidated when the pupil ...