What IQ Measures
IQ, or Intelligence Quotient, is a score derived from standardized tests designed to measure human cognitive abilities. These tests assess skills such as pattern recognition, memory, and problem-solving. While no single test is perfect, IQ scores provide a consistent way to compare cognitive performance across populations.
Record Holders
Various individuals have been reported to hold very high IQ scores, though exact rankings vary by source and testing method. Some widely cited names include William James Sidis and Terence Tao, with reported scores far above the average range. For a broader look at notable high scorers, see this overview on IQ and intelligence.
How Scores Are Compared
IQ tests are normalized so that the average score is set around 100, with most people falling between 85 and 115. Scores above 130 are often considered highly gifted, while scores above 140 are rare. Because different tests use different scales, direct comparisons should be made with caution, and context such as age and test version matters.
