Two factors, in particular, could reveal a person’s inner state: the length of time it takes the pupil to dilate in response to a flash of light and how the pupil transitions from dilation to ...

Dementia affects nearly a million people in the UK, but spotting it early can help slow down the onset of symptoms as one ...

They noted that donations “increased for portraits with dilated pupils only in species with bright irises.” Scientists used altered photos of non-human primates across several different ...

Pupils size during the sleep can tell the memories you are experiencing. A new study has investigated the link between pupil dilation/contraction and memory processing during sleep. The study ...

Dilation and constriction of the pupils reflect not only changes in light intensity but also ongoing mental activity. The response is a measure of interest, emotion, thought processes and attitudes ...