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

Scientists have discovered a link between pupil size during non-REM sleep and the processing of new and old memories.

Pupil Biofeedback: A Window into the LC and ... Stress-related and anxiety disorders often involve heightened arousal states, which can make relaxation and focus challenging.