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The reason why we can’t see our eyes moving with our own eyes is because our brains edit out the bits between the saccades—a process called saccadic suppression. Without it, we’d look at an object and it would be a blurry mess. What we perceive as vision is the director’s cut of a film, with your brain as the director, seamlessly stitching together the raw footage to make a coherent reality. Perception is the brain’s best guess at what the world actually looks like. Immense though the computing power of that fleshy mass sitting in the darkness of our skulls is, if we were to take in all the information in front of our eyes, our brains would surely explode.** Instead, our eyes sample bits and pieces of the world, and we fill in the blanks in our heads. This fact is fundamental to the way that cinema works. A film is typically 24 static images run together every second, which our brain sees as continuous fluid movement—that’s why it’s called a movie. The illusion of movement actually happens at more like 16 frames per second. At that speed, a film projection is indistinguishable from the real world, at least to us. It was the introduction of sound that set the standard of 24 frames per second with The Jazz Singer in 1927, the first film to have synchronized dialogue. The company
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Adam Rutherford (The Complete Guide to Absolutely Everything (Abridged): Adventures in Math and Science)