Insights into Human Intelligence
Plain-language articles on IQ scores, cognitive domains, intelligence research and how to interpret your own results.
The 5 Cognitive Domains: Understanding Your Mental Profile
What logical, spatial, numerical, pattern and verbal reasoning each measure, which tasks test them, where they matter in real life, and how to read a profile.
Average IQ by Age: Norms, Peaks & Cognitive Changes Across Lifespan
Why average IQ is 100 at every age, which abilities peak at 18, 30 or 65, how age-normed scoring works, and what helps keep your thinking sharp as you age.
The 5 Cognitive Domains: Understanding Your Mental Profile
What logical, spatial, numerical, pattern and verbal reasoning each measure, which tasks test them, where they matter in real life, and how to read a profile.
How Accurate Are Free Online IQ Tests? Science, Validity & Limitations
How online IQ tests compare with clinical WAIS assessments, why many sites inflate scores, what affects your result at home, and how much to trust the number.
10 Common IQ Test Myths Debunked by Modern Cognitive Science
Einstein's IQ, scores above 200, brain-training apps, fixed intelligence and more: 10 widespread myths about IQ testing and what the research actually shows.
The 7 Types of Intelligence: Beyond Traditional IQ Scores
Gardner's multiple intelligences explained: logical, verbal, spatial, bodily, musical, interpersonal and intrapersonal, and how they relate to IQ scores.
Can You Improve Your IQ? What Science Says
Does practicing IQ-style questions make you smarter? What the evidence says about working memory training, exercise, sleep, education and the practice effect.
Fluid vs. Crystallized Intelligence: Differences, Aging & Measurement
Fluid intelligence (Gf) vs. crystallized intelligence (Gc): what each one is, when each peaks, how they change with age, and how the WAIS measures both.
What IQ Score Do You Need for Mensa? Requirements & Qualifying Tests
Mensa requires a score in the top 2%: 130 on the Wechsler scale, 132 on Stanford-Binet, 148 on Cattell. Which tests qualify, and how to prepare for the exam.
What Is IQ? A Complete Guide to Intelligence Quotient
What IQ actually measures, how modern deviation scores are calculated, its history from Binet to Wechsler, what IQ predicts, and what it can't tell you.
Put Theory Into Practice: Test Your IQ
Take the free 40-question test or the 15-minute Quick test. Instant score and 5-domain breakdown.