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February 3rd, 2010

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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

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[User Picture]
Date:February 4th, 2010 12:50 pm (UTC)
That makes sense (also a common refresh rate for computer monitors), but what I meant was that it's odd that the frequency for house current happens to be 60 Hz. Since house current was invented before television, it seems unlikely that whoever chose that frequency did so because he knew it would eventually match the human eye's flicker-fusion rate and make TV work. :)

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