Pop-ups beat gradual frictions for high-impulsivity TikTok users, study finds

A team from Ulm University and Santa Clara University conducted a 7-day within-subject randomized field study (N=104) to compare interventions for reducing compulsive infinite scrolling on short-form video platforms like TikTok. They tested a baseline pop-up and two gradually intensifying design frictions: a visual gradual (decreasing brightness) and a haptic gradual (increasing vibration). Using objective behavioral logs and subjective ratings, they found that the pop-up was initially effective but lost impact quickly, whereas the visual gradual intervention sustained high subjective effectiveness longest. Bayesian modeling revealed that context (e.g., time of day, location) had little influence, but individual traits in self-regulation played a key role.

For participants with low impulsivity, all three interventions were similarly effective. For highly impulsive users, the explicit pop-up was significantly more effective than either gradual design—suggesting that subtle nudges may be ignored when self-control is low. The study challenges the assumption that gradual, less intrusive interventions are universally better. Instead, designers of digital well-being tools should tailor interventions to users' impulsivity levels. The paper provides a nuanced framework for personalizing scrolling interventions, balancing long-term habit change with immediate behavioral friction.