In SRS design, Anki and Quantum Country ask you to think of the answer; Duolingo and Execute Program ask you to input an answer.
I’d thought: latter’s likely more effective, but annoying & slow. Surprised to see these studies found little diff in recall: andymatuschak.org/files/papers/L
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Right! My instinct is that it’s variation itself that we respond to there. Variation in vibe (feels bad when prompts get “backed up” and you see many from one stratum); variation in task (multiple choice; typing; etc); variation in wording (repeated text dulls attention)…