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Deaf and hard of hearing (DHH) viewers watch multimedia with captions on devices with widely varying widths. We investigated the impact of caption width on viewers' preferences. Previous research has shown that presenting one word lines allows viewers to read much more quickly than traditional reading, while others have shown that the optimal width for captions is 6 words per line. Our study showed that DHH viewers had no preference difference between 6 and 12 word lines. Furthermore, they significantly preferred 6 and 12 word lines over single word lines due to the need to split attention between the captions and video.
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