Pupil dilation provides a physiological readout of information gain during the brain's internal process of belief updating in the context of associative learning.

Scientists from the University of California San Diego School of Medicine are suggesting Alzheimer’s disease may be detected years before symptoms appear by examining pupil dilation. The new study ...

Tsukuba, Japan—In a study conducted by researchers from the University of Tsukuba to identify activation of the arousal system, it was found that even very light intensity exercise elicited pupil ...

Many factors can influence pupil size. Typically, the pupils open up in low light situations to let in more light. However, some research suggests that attraction and mood might also cause pupil ...

The dark part of your eye is called the pupil. Pupils can grow or shrink according to different lighting conditions. Other factors, such as drugs, can also affect pupil size. Read on to find out which ...

New pupillometry research reveals how post-traumatic stress disorder (PTSD) may affect both branches of the autonomic nervous system. By measuring how someone's pupils dilate and constrict in response ...