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Video segments captioned at different speeds were shown to a group of 578 people that included deaf, hard of hearing, and hearing viewers. Participants used a five-point scale to assess each segment's caption speed. The "OK" speed, defined as the rate at which "caption speed is comfortable to me," was found to be about 145 words per minute (WPM), very close to the 141 WPM mean rate actually found in television programs (Jensema, McCann, nor was education, with the exception that people who had attended graduate school showed evidence that they might prefer slightly faster captions.
Carl J. Jensema (Thu,) studied this question.