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
IQ Insights
In-depth, research-based guides on IQ scores, intelligence testing, demographics and how to take a test — from the IQCognify editorial team.
Latest articles
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
Cognitive Reflection Test: Answers & What It Measures
The Cognitive Reflection Test answers are 5 cents, 5 minutes and 47 days. Why the intuitive answers fail, what your score means, and whether knowing the answers really invalidates it.
9 min read
Cognitive Tests Explained: Types, Scores & What They Measure
Cognitive tests fall into three unrelated categories. How clinical screens like the MoCA and MMSE differ from IQ tests, what the scores mean, and why the 26/30 cutoff misleads.
10 min read