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So if it's < 24fps your brain can't fill in enough information between frames to make it seem smooth. If it's > 25 then you brain has enough information that it doesn't need to do any work at all. 24 is right at this sweet spot where your brain needs to works, but it's smooth.
So, I think that requiring the brain to continually inject frames and do work while viewing 24fps, but not so much that it can't fill in frames making it jerky, results in an impact on cognition similar to hypnosis because you have to concentrate to view it, and it's rhythmic.
I also think that this "injecting of frames" causes a perceptual effect that prevents you from seeing flaws because your brain is basically injecting lies and ignoring things to keep up. Once you hit 30 or 60fps a lot of this effect disappears.
At say 30 or 60 I think your brain has to do no real work to comprehend the motion, and so you can focus more intently on flaws and you don't have to concentrate as hard so it has less impact on you than 24fps. So, how could you test that?
What if you got people to watch horror movie shorts at different fps and then rated how scary they found them? I predict that the 24fps versions would have a larger impact than the 30fps or 60fps versions. Now, *then* you do something really interesting:
Quiz the viewers on special effects flaws they saw in the movie. I predict that people will see more flaws in the 30fps and 60fps than 24fps, and as long as the effect flaws are controlled for, then you can see if movie speed is the influencing factor rather than flaws.
So my prediction is: Horror movies at 24fps have more emotional impact on the viewer than 30 or 60 fps when controlled for the number of special effect flaws they remember. Another could be just strap them to an fMRI and watch what their brain does with both. Probably easier.
The brain is constantly doing that work. We’re living the dream, to borrow the quote. What I think you’re correct about is that static stable frames past a certain rate *override* the internal signal,prove it wrong in ways maybe hypnotic, pretty, uncomfortable. But not very real.
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