Blog
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?The honest answer, the hardware caveat, and why the popular figure is wrong.Updated 27 July 2026How Working Memory WorksThe loop, the sketchpad, the four-item limit, and why your two spans disagree.Updated 27 July 2026The Stroop Effect ExplainedNinety years of a very robust finding, and the claims it will not support.
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.