It is possible to measure the point at which the human eye stops noticing choppiness and begins to perceive a moving picture as fluent, and it is roughly 24-25 FPS.
Hence the debunked theory of the “25th frame”, the proponents of which believed that if we alternate 24 normal moving picture frames per second and one special frame with some written slogan, the 25th frame will not be noticed consciously and will directly affect the subconscious.
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