"Every perception is to some degree an act of creation, and every act of memory is to some degree an act of imagination."
-- Gerald Edelman, Second Nature: Brain Science and Human Knowledge
10 The early impact of the prototype mnemonic medium12 The early impact of the prototype mnemonic mediumThe early impact of the prototype mnemonic mediumHow can we develop transformative tools for thought？2020-10-18Journal
What happened? Well, for those users whose reviews were delayed, accuracy dropped from 91% (upon the initial read) to 87% (after two weeks). This may seem a small drop, but keep in mind that users continued to review other cards, which almost certainly boosted their final performance, since those other cards had some overlap in content with the delayed cards. It's difficult to avoid this kind of overlap without delaying reviews on all cards, a more drastic change in user experience than we wanted to impose. For users who were asked to review the cards as normal, accuracy improved from 89% to 96%. The short summary is: when users didn't review the cards, accuracy dropped by 4%; when they did review the cards, accuracy increased by 7% In more detail: there were 16 users in the group that did the reviews, per usual, and 25 users in the group where reviews were delayed. The 95% confidence intervals were: 91 ± 4%, 87 ± 5%, 89 ± 5%, 96 ± 3%, assuming each variable is binomial, independent and identically distributed. This latter assumption is approximate, since we'd expect some user- and question-dependent effects. Note also that this was done in an earlier version of Quantum Country, where the review schedule had intervals of one day, three days, one week, and and two weeks..