Does an IQ Test Need Your Email? What Free Tests Collect
Some free IQ tests ask for your email before showing results, others don't. Here's what that data is actually used for, and how to tell them apart.
3 min read
IQ Insights
In-depth, expert-reviewed guides on IQ scores, intelligence testing, demographics and how to take a test — from the IQCognify editorial team.
Latest articles
Neuromyths in Education: The Brain Myths Teachers Believe
Learning styles, the 10% brain, left- vs right-brained learners — surveyed teachers endorse these at strikingly high rates. What the evidence says.
5 min read
The Negative Flynn Effect: Are IQ Scores Actually Falling?
IQ scores rose for a century, then reversed in several countries. The best evidence shows the fall is environmental, not genetic.
7 min read
Test Anxiety and IQ Tests: How Much Does It Cost You?
Test anxiety lowers scores — but the worrying does the damage, not the racing heart. What 238 studies show, and which subtests are most exposed.
6 min read
Gifted Identification: How Children Are Actually Selected
The 130 threshold, the General Ability Index, extended norms — and the evidence that gifted identification fails at referral, not testing.
7 min read
The g Factor: What General Intelligence Actually Is
Every cognitive test correlates with every other. g is the model extracted from that pattern — not a substance in the brain. What the evidence shows.
9 min read
What Is Working Memory? Definition, Capacity & Link to IQ
Working memory holds and manipulates information for seconds at a time. Its real capacity is about four chunks — not seven — it correlates with fluid intelligence at r ≈ .72, and it forms one of the four index scores behind your WAIS IQ.
10 min read
What Is the Average IQ in the USA? (2026 Data & Sources)
The average IQ in the USA is 100 — by design. Here's why some sites say 97.43, what state IQ rankings actually measure, and how US adults really compare internationally.
10 min read
WAIS Intelligence Test: Structure, Scores & Interpretation
The Wechsler Adult Intelligence Scale is the world's most used adult IQ test. Its editions, index scores, the General Ability Index — and why independent researchers reject the WAIS-5's five-factor structure.
8 min read