Learn about IQ testing, brain training, and cognitive science
Spearman's g Factor: The Theory of General Intelligence The concept of general intelligence — often abbreviated g — is one of the most debated and influential ideas in the science of the mind. Propose...
Pattern Recognition: The Core Skill Tested in IQ Assessments When researchers and psychologists strip intelligence testing down to its essential core, one cognitive skill appears more often than any o...
Working Memory Explained: Why It's the Foundation of Learning Working memory is the cognitive system that holds and manipulates information in your mind while you're actively using it. It is not the s...
Fluid vs Crystallized Intelligence: Two Types of Cognitive Ability Cognitive ability is not a single, uniform trait. Psychologists Raymond Cattell and John Horn proposed in the 1960s that what we call...
IQ Percentile Explained: What Top 1%, 2%, and 5% Really Mean When someone says their IQ score is in the "top 2%," what does that actually mean? Percentile rankings convert a raw IQ score into a statem...
Average IQ by Age: How Scores Change Across the Lifespan IQ scores are not fixed across the human lifespan. Research stretching back decades shows that both the average score reported for a given age ...
What Is a Good IQ Score? Understanding the Scale from 85 to 145 The question "what is a good IQ score?" sounds simple but has a more nuanced answer than most people expect. IQ scores follow a bell-cur...
IQ 90: A Score on the Low Side of Average An IQ score of 90 is one of the most misread numbers on the scale. Because it sits below 100 — the population mean — many people assume it signals something p...
IQ 85 to 89: Understanding the Low-Average Range An IQ score between 85 and 89 is one of the most frequently misunderstood positions on the IQ scale. It sits just below the statistical center, yet it ...
IQ 140 and Above: Exploring the Gifted Range An IQ score of 140 sits in a part of the bell curve that few people ever reach. It represents a statistical rarity — roughly 1 person in 250 — and it is fr...
IQ 110: What a Slightly Above-Average Score Indicates An IQ score of 110 is among the most commonly reported results — and one of the most ambiguously described. It sits in a narrow zone between "aver...
IQ 130: The Top 2% Threshold and What It Actually Means An IQ score of 130 carries unusual weight in popular discussion. It is widely cited as the boundary between "superior" and "gifted," and it is t...
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