I would love to watch brain images of people (and to know what I was seeing) of how this works differently to different people. My husband is like this.I can't watch tv and turk at the same time.
i tried doing that to watch luke cage last week, but it still took like 5 hours to watch two episodes, between pausing so I can pay attention to stuff [quick timers especially]
I have to have something else playing or going on because it sort of 'captures' my attention when it wanders, it sort of pre-empts my distractions, hard to explain. Like how i did homework better with the tv on but my parents wouldn't allow it, and I just could not focus. If there is something that really has to be focused on I tune it out.