Technology in Film Survey (For College)

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I thought we could only register 24 frames/second. So I guess it'd be redundant.

This is clearly not true, otherwise there would be no difference between 24 Hz and 60 Hz refresh rates. There is a very noticeable difference between 24 fps and 60 fps when playing video games for example. Anyway, the answer to this is much more complicated than a simple number, since there is no "refresh rate" as such. I'm not completely sure, I have only read a little on the issue, but it seems that humans can theoretically "register" up to 200 frames per second under the right circumstances.