Many folks (myself included) worry about "pattern matching" in spaced repetition—that they're learning to parrot a response in a narrow context. This experiment tried varying question text to combat that and, surprisingly, got a null result. andymatuschak.org/files/papers/B
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I worry that the narrow pattern matching primarily hurts the "recognition" element of far transfer, i.e. that you match the knowledge to the card rather than to a broader concept of situations in which it'd be helpful. As the authors state, they didn't test that :-(
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