Does watching someone else relieve a nagging itch spark the same impulse in you? A study in mice suggests contagious itching may have evolved as a reflex to protect animals from threats. Now, Chen and ...

The human retina contains some 100 million photoreceptor cells. When these are stimulated with light, they communicate that information to the brain and we perceive light. Researchers have now ...

Photic sneeze reflex is a condition triggered by exposure to bright light. Around 35% of the population has this reflex. Sneezing is a natural response that removes irritants from your nose. But while ...

Pupil size in response to light could serve as a biomarker for concussion, according to a study published in Life. “A concussive injury to the brain is associated with changes in the PLR [pupillary ...