The complete guide to spaced repetition - the most effective study technique according to cognitive science. Learn the science, the schedule, and how to combine it with audio learning.
Catch information before it fades from short-term memory.
Strengthen the memory trace during the critical consolidation period.
Push information into intermediate-term storage.
Solidify long-term memory pathways.
Confirm long-term retention. Information is now durable.
In 1885, Hermann Ebbinghaus discovered the 'forgetting curve' - we lose ~70% of new information within 24 hours if we don't review it. Spaced repetition fights this by reviewing material at precisely the right intervals, just before you would forget.
Spaced repetition works best with discrete concepts. Instead of reviewing entire chapters, break content into specific facts, definitions, processes, or principles. VoiceBrief's AI quiz and flashcard features do this automatically from your PDFs.
The SM-2 algorithm (used in Anki and VoiceBrief) calculates optimal review intervals based on your performance. Easy items get longer intervals; difficult items get shorter ones. The goal is to review each item at the exact moment before you'd forget it.
Here's the power move: use audio learning for initial exposure and concept understanding, then spaced repetition quizzes to lock it in. Listen to a chapter during your commute, then quiz yourself the next day. Re-listen to sections you got wrong.
Monitor your quiz scores by topic. If you're scoring 90%+ consistently, the intervals are working. If scores drop below 70%, increase review frequency for those topics. VoiceBrief tracks this automatically and adjusts your review schedule.
VoiceBrief combines audio learning with SM-2 spaced repetition. Upload a PDF, listen to it, then let the AI quiz you at optimal intervals.