Your statement about attention reminded me of this article about the creators of CoComelon.
"It’s a small TV screen, placed a few feet from the larger one, that plays a continuous loop of banal, real-world scenes — a guy pouring a cup of coffee, someone getting a haircut — each lasting about 20 seconds. Whenever a youngster looks away from the Moonbug show to glimpse the Distractatron, a note is jotted down."
https://www.nytimes.com/2022/05/05/arts/television/cocomelon-moonbug-entertainment.html
Your statement about attention reminded me of this article about the creators of CoComelon.
"It’s a small TV screen, placed a few feet from the larger one, that plays a continuous loop of banal, real-world scenes — a guy pouring a cup of coffee, someone getting a haircut — each lasting about 20 seconds. Whenever a youngster looks away from the Moonbug show to glimpse the Distractatron, a note is jotted down."
Pretty dark.