Asleep or Awake?

Somebody pinch me! Am I REALLY awake? This is Sandra Tsing Loh with the Loh Down on Science. Brain injury can make it difficult to tell if someone’s conscious or not! Patients in a coma may respond to things, but only as a reflex. How can doctors tell the difference?

Night Vision

As “Game of Thrones” fans know — winter is coming! Let’s hope the white walkers don’t have night vision! This is Sandra Tsing Loh with the Loh Down on Science. We humans aren’t the best at night vision. We detect motion with direction-selective ganglion cells, or DSGCs. Some specifically detect