Verbal Reasoning: What It Measures & Why Vocabulary Predicts So Much
Verbal ability rises into your sixties, and is stable enough that clinicians use vocabulary to estimate the IQ you had before an illness. Plus where that method fails.
6 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
Psychometrics: How Psychological Measurement Actually Works
A test is never valid — an interpretation is. Reliability, validity, standard error, norming and latent variables, explained from the governing Standards.
6 min read
Aptitude Test vs IQ Test: A Distinction That Mostly Collapsed
Aptitude tests never measured innate potential. Why the SAT dropped the word in 1993, what still separates the two, and why most aptitude tests measure g anyway.
5 min read
What Is a Good IQ Score? Average, High & Gifted Explained (2026)
What counts as a good IQ score? A clear beginner's guide to the average (90–109), high-average and superior (110–129), gifted (130+) and genius (140+) ranges, with percentile context, tables and real-world interpretations.
5 min read
The Flynn Effect: Why IQ Scores Rose for a Century (2026)
The Flynn effect is the generational rise in average IQ scores — about 3 points a decade in the 20th century. What causes it, whether it's still happening, its criticisms, and what it means, in plain English.
4 min read
Multiple Intelligences: Gardner's Theory Explained (2026)
Howard Gardner's theory of multiple intelligences proposes several distinct intelligences rather than one IQ. The eight intelligences, how it differs from 'g', the criticisms, and why scientists are skeptical.
4 min read
IQ vs EQ — What's the Difference and Which Matters More?
IQ measures reasoning; EQ measures emotional intelligence. How they differ, how each is assessed, and what the research says about which predicts success.
4 min read
The History of IQ Testing — From Binet to Today
From Alfred Binet's 1905 scale to modern adaptive testing: the people, milestones and controversies that shaped how we measure intelligence.
4 min read
Types of IQ Tests — Wechsler, Raven's, Culture-Fair & More
A guide to the major IQ tests — WAIS, Stanford-Binet, Raven's Progressive Matrices, culture-fair tests — what each measures and how they differ.
4 min read