That's exactly why 48fps we think looks fake, because we're conditioned to feel 24fps is "movie" and clearer images and higher frame rates (which provides more and better information to the eyes) are fake based on a lifetime of experience.
Things look "fast" because we're programmed to anticipate things looking slow in movies due to all the blur in fast moving sequences by watching 24fps movies for a lifetime.
They look fast because we're clearly seeing what's happening instead of a blurry mess.
So people think it looks like other things in their experience that have a high framerate.. soap operas and video game cutscenes.
Video game makers do the exact opposite, they introduce artificial motion blur to make the games look closer to a 24fps movie rather than a 60fps game, so our brain will associate it with that.
I'm not convinced that it's actually an "uncanny valley" situation, but maybe.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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