Topic · 7 guides and articles
IQ research
What the research says about IQ: scores by country, how IQ changes with age, what scores predict in life and what moves test performance. Every claim is linked to its source.
- 01Core guideIQ score by countryExplore national IQ estimates for 249 countries and territories, with the data behind each one.Read
- 02Core guideWhat practice changes on an IQ testWhat practice, sleep and test familiarity do to your score, backed by the research.Read
- 03Core guideWhat IQ scores predictThe research on IQ and school, work, income and health, with the size of each link.Read
- 04ArticleDual N-Back: How It Works, What the Research Shows, and How to StartDual n-back trains how you hold and update information. See four key studies side by side, what they say about IQ, and how to start training today.Read
- 05ArticleDoes IQ Change With Age? What Moves and What StaysAge norms compare you with your peers; stability is a separate question. Same-test scores at 11 and 70 correlated .67. See what shifts, with worked ranges.Read
- 06ArticleCan You Improve IQ Test Performance? What the Evidence ShowsA look at what moves online IQ test performance — and a practical process loop for anyone who wants to compare with their own previous result.Read
- 07ArticleHow to Get Your Best Online IQ Test Result (Without Fake Hacks)A practical system for a cleaner online IQ test result with better setup, pacing, practice on the format, and a repeatable pattern-solving framework.Read