In the case of watching an hour of video, you're just there consuming what's going on. Reading a novel requires you to world build internally. I'd say that sort of attention is a much higher intensity version. Or at least it takes a lot more active involvement.
If you've ever sat for meditation you'll know that low-input stimulation can be much harder to keep your attention on, but being lost in daydreaming and 'monkey-mind' chatter is pretty effortless. Once you train in it it becomes no big deal, though. Same is true for reading novels.
In the case of watching an hour of video, you're just there consuming what's going on. Reading a novel requires you to world build internally. I'd say that sort of attention is a much higher intensity version. Or at least it takes a lot more active involvement.
If you've ever sat for meditation you'll know that low-input stimulation can be much harder to keep your attention on, but being lost in daydreaming and 'monkey-mind' chatter is pretty effortless. Once you train in it it becomes no big deal, though. Same is true for reading novels.
https://pubmed.ncbi.nlm.nih.gov/23988110/