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

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 ...

A novel ophthalmic spray containing 1% tropicamide and 2.5% phenylephrine was noninferior to traditional eye drops for producing changes in the maximum pupil diameter and percentage of pupillary ...

Amanda Meyer is affiliated with the Australian and New Zealand Association of Clinical Anatomists, the American Association for Anatomy, and the Global Neuroanatomy Network. Monika Zimanyi is ...

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 ...

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 ...

Dilated pupils (mydriasis or fixed pupils) are when your eyes' pupils, which let light into your eyes, become wider. This can ...