Not sure if this is the right Stack Exchange for this question, but please point me toward a better site if it exists.

In Daniel Dennett's book, "Consciousness Explained," he writes:

Standard motion pictures run at twenty-four frames per second, so the film advances a frame every 42msec (actually, each frame is held stationary and exposed three times during that 42msec, for durations of 8.5msec, with 5.4msec of darkness between each). [1]

Is this still true for digital cinema projectors? (The book is from 2017, but I'm still not sure what he means by "standard" motion pictures.) From what I can tell on Wikipedia, digital cinema still uses the concept of "frame rate," but the notion may not be as clear-cut as it was for traditional film.

An additional question is: Where can I find information on the exact bright/dark timing used for different frame rates, video standards, and technologies? I find it fascinating that the screen could be dark 40% of the duration of a movie without the viewer realizing it, and would love to be able to look up this kind of fact for TV and other media.

[1] Dennett, Daniel C. Consciousness Explained (p. 103). Little, Brown and Company.

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