Push notifications are associated with distraction. But the same mechanism that makes them distracting makes them effective for vocabulary retention. Here is the science behind push notification learning and interruption-based memory.
Why Interruption Improves Memory
The Zeigarnik effect (1927) shows interrupted tasks are remembered better than completed ones - incomplete cognitive states stay active in working memory. For vocabulary, an unexpected push notification creates a context switch. The word arrives when you are not in study mode. That unexpectedness produces slightly better encoding than reviewing the same word in a predictable study session.
Distributed Practice Effect
Push notifications distribute practice across the day. The distributed practice effect is one of the most replicated findings in cognitive psychology: learning spread across multiple sessions produces better long-term retention than the same amount concentrated in one session. Five vocabulary review notifications across a day produce better retention than reviewing those five words once in a study session.
Spaced Repetition Via Notifications
The optimal push notification system schedules reviews based on how well you know each word - spaced repetition delivered via notifications. Words you struggle with come back sooner; words you know well come back later. TransLearn's push notification system works this way: personal vocabulary words reviewed at spaced intervals throughout the day, combining spaced repetition timing with interruption-based encoding.
Making Notifications Work
Notifications only produce retention if you engage with them. Keep frequency at 5-10 per day - high enough to distribute practice, low enough that you do not train yourself to ignore them. Read each word when it arrives, attempt to recall the meaning before seeing the answer. Those two behaviors are what makes push notification learning produce measurable vocabulary retention.