There's a nice short article in The Guardian, reporting on recent research that solves the mystery of why we don't notice when we blink. The bottom line is
"When the eyes shut, even for a fraction of a second, the visual system of the brain shuts down too. So you cannot know that you are fleetingly in the dark"
There's a cute experimental setup through which University College London researchers figured this out, and the article does a great job succinctly describing the work in just three paragraphs.
