A one-second pause — and an easy way to back out — cut compulsive app-opening by about a third. Friction beats willpower.
The situation, the move, the outcome.
Researchers tested 'one sec,' an app that adds a brief friction step — a deep breath and a short wait — whenever you try to open a target app like Instagram or TikTok, then offers an easy 'close it' option. In a six-week field study of 280 people published in PNAS, participants closed the target app about 36% of the time after the pause interfered, and attempts to open those apps fell roughly 37% by the end versus the first week. Breaking down the mechanism, the researchers found the option to back out was the strongest ingredient, with the time delay also helping.
Why it matters beyond one family.
The finding generalizes beyond one app: small, well-placed friction interrupts automatic habit loops better than relying on willpower or guilt. It's a design lesson families can borrow with free, built-in tools.
How to apply it.
- Add a deliberate speed bump before the apps your teen opens on autopilot.
- Make backing out easy — the 'close it' option did the most work in the study.
- Treat it as redesigning the habit, not testing your teen's self-control.
Concrete next steps.
- Try one sec, or recreate the effect with built-in screen-time limits and app timers.
- Move tempting apps off the home screen and into a folder to add friction.
- Turn on 'take a break' / reminder features inside the apps themselves.
Read it for yourself.
- PNAS — directing smartphone use through the self-nudge app one sec pnas.org ↗
- PMC — full text of the one sec field study pmc.ncbi.nlm.nih.gov ↗
- PubMed — one sec self-nudge study record pubmed.ncbi.nlm.nih.gov ↗
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