What's going on
Generating an attempt — even a bad one — makes you search your memory for anything related, activate a network of half-relevant knowledge, and commit. When the correct answer then arrives, it lands in a mind that is primed, engaged, and now has a specific error to correct. Being told the answer cold lands in a mind that is doing nothing at all.
There is also a strong emotional component: the small sting of being wrong is a memory aid. You remember the answers you were embarrassed about.
How to exploit it
- Pre-test before the lecture. Try the end-of-chapter questions *before* you read the chapter. You will get most of them wrong. The reading is then dramatically more effective, because you know what you're looking for.
- Guess the definition before revealing the flashcard. Never flip a card without committing to an answer, even a bad one. Flipping without guessing is re-reading with extra steps.
- Predict the result before the derivation. Then find out where your intuition was wrong.
- Attempt the problem before looking at the worked solution. Watching a solution you never attempted is the fluency illusion in its most seductive form — every step looks obvious, and none of it is retrievable.
Why nobody does this
Because it involves being wrong, repeatedly, on purpose, in the privacy of your own room, and it is unpleasant. The alternative — reading the answer, nodding, feeling competent — is available at all times and feels much better. That is the trade you are making, and it is the same trade as everywhere else in learning: comfort now, or performance later.