The waiter who started it
Bluma Zeigarnik was a psychology student sitting in a Vienna cafe when she noticed something odd about the waiters. They could recite a complicated, unpaid order in perfect detail, every substitution and side dish, without writing anything down. The moment the bill was paid, that same detail vanished. Ask the same waiter to recall an order they'd already closed out, and they couldn't.
She turned the observation into an experiment. Participants worked through a series of small tasks, and some were allowed to finish while others were interrupted partway through. Later, asked to recall which tasks they'd worked on, participants remembered the interrupted, unfinished ones roughly twice as often as the ones they'd completed.[1] Follow-up research over the following decades has replicated the core finding, that an unresolved task occupies more active attention than a resolved one, though later work also found it's more fragile and context-dependent than Zeigarnik's original framing suggested.[2]
What a badge actually represents
A notification badge isn't information. It's a count of open loops, things marked unfinished until you tap them. The number doesn't tell you if the notification is a birthday reminder or something that matters. It doesn't need to. Under the Zeigarnik effect, the unfinished status alone is what keeps pulling attention back, independent of what's actually inside.
That's a different mechanism from the feed-ranking and reward-schedule tricks covered elsewhere in this library. A slot-machine style pull-to-refresh works because you don't know what you'll get. A notification badge works because you already know something is unresolved, and the not-knowing isn't the point, the openness is.
Why closing the badge feels like relief
This also explains why tapping a notification, even a boring one, produces a small real sense of resolution. Most of the time you're not getting new information. You're closing an open loop, exactly the kind of action the underlying research predicts will reduce how much a task occupies attention. The relief is real. It's also why the next badge starts the cycle again immediately.
What this means for actually quieting a phone
None of this argues for ignoring every notification, most of them point at something genuinely useful, a message from a person, a calendar reminder. What it argues against is the badge as a permanent, ambient counter sitting on an app icon whether or not you've opened the app that day. DoomOff doesn't touch notifications directly. It removes the feeds and recommendation surfaces designed to generate open loops in the first place, the endless Explore grid, the autoplaying Shorts shelf, the For You page, so there's less being manufactured for a badge to represent.