Published research
The findings the product is built on. Real papers, real numbers, and the caveat that goes with all of them: these are group-level results, not an individual guarantee.
g = 0.37–0.7247 studies · 65 group comparisons
Working memory responds to training.
Across a meta-analysis of working-memory training trials, trained groups outperformed untrained controls on short-term and working-memory tasks they had never practised. Small-to-moderate, and replicated widely. This is the effect the training loop is built on.
Schwaighofer, Fischer & Bühner, 2015 · Educational Psychologist
Age + baseline80 adults · ages 65–95 · 9 sessions
How much you gain depends on where you start.
In a controlled trial, baseline performance and age predicted the size of the training gain. Which is exactly why the plan is built from your own readings instead of a fixed curriculum handed to everybody.
Zinke et al., 2014
Spacing wins254 studies · 317 experiments
The same minutes, spread out, are worth more.
Distributed practice beat massed practice across a large quantitative synthesis of the recall literature. The daily session is short by design, and the interval between sessions is part of the method rather than a scheduling convenience.
Cepeda, Pashler, Vul, Wixted & Rohrer, 2006 · Psychological Bulletin