|03:21 pm - I'd always wondered...|
"In all mammalian eyes, rods and cones make electrical activity out of light waves by means of a change of pigment in the cells. The rate at which cells do this is called the 'flicker-fusion' rate: the number of snapshots of the world that the eyes take in every second. The flicker-fusion rate of humans is 60 images every second. Dogs have higher rate: 70 or 80 cycles a second.
"Like film, the image on your (non-digital) TV is really a sequence of still shots sent quickly enough to fool our eyes into seeing a continuous stream. But it's not fast enough for dog vision. They see the frames and the dark spaces in between them, too."
—extracted from Inside of a Dog by Alexandra Horowitz