I think you're right in absolute terms, that captions require more attention than audio generally, that's only true if you're choosing one or the other, when most people are doing both.
With audio, if you missed a word, because you were focussing on something else for a moment, you have to rewind. If you have captions on, you can glance quickly at the screen, read the word or two that you missed, allowing you to 'recover'.
That allows you to pay even less active attention to the audio, because you know you can always 'error-correct' later.
With audio, if you missed a word, because you were focussing on something else for a moment, you have to rewind. If you have captions on, you can glance quickly at the screen, read the word or two that you missed, allowing you to 'recover'.
That allows you to pay even less active attention to the audio, because you know you can always 'error-correct' later.