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The longer answers. What a score means, what it cannot mean, and where the popular numbers came from.
Updated 27 July 2026What Is a Good Reaction Time?Learn what counts as a good reaction time, how hardware changes the result, and why the popular benchmark is misleading.Updated 27 July 2026How Working Memory WorksLearn how verbal and visual working memory operate, why capacity is limited, and why test results can disagree.Updated 27 July 2026The Stroop Effect ExplainedExplore ninety years of evidence about the Stroop effect, including what this reliable finding does and does not show.Updated 5 August 2026Do Brain Training Games Work?See why practice improves the trained game, why broader benefits fade, and what regulators say about stronger claims.
How these are written
Every article carries a test you can take inside it, so you can put a number to whatever it is describing before you finish reading.
Sources are listed at the foot of each one. Where a widely repeated figure turns out to have no source behind it, the article says that plainly rather than repeating it.