The AurorIQ Library
Understand the science of intelligence.
Plain-language guides to IQ, cognitive domains, and what scores actually mean, grounded in published research rather than hype.
How this library works
Intelligence is one of the most over-mythologized subjects on the internet, which is exactly why this library exists. Every guide here is written to a single standard: say what the published research supports, say where it's contested, and never dress up a finding to make a score feel more dramatic than it is. The collection is organized into four tracks — start with the fundamentals if you're new to the subject, or jump straight to score ranges if you've just received a result and want to know what the number means.
Guides are written and maintained by the team behind the AurorIQ adaptive test, drawing on the same psychometric literature the test itself is built on — you can read about that foundation on our methodology page.
Understanding IQ
What intelligence testing actually measures, and where its limits are.
Before scores and percentiles make any sense, it helps to know what an IQ test is actually claiming to measure — and the answer is narrower, older, and more interesting than most people assume. These three guides cover the concept itself, the fluid/crystallized distinction that underpins nearly every modern test, and an unusually candid answer to the question everyone asks about online testing.
What is IQ, really?
What an IQ score represents, where the concept came from, and the limits of reducing a mind to one number.
Read Pillar guideHow to study effectively
Why the methods that feel productive are the weakest — and what cognitive science shows actually works.
Read Pillar guideHow to choose a career
Interests, values, and work style — three lenses on career fit, and why using all three beats any one.
Read Pillar guideHow to build habits that stick
Why habits are built by design, not willpower — the loop, the five factors, and how long it really takes.
Read TheoryFluid vs crystallized intelligence
The two engines of cognition: one you're born tuning, one you build over a lifetime.
Read MethodologyHow accurate is an online IQ test?
What adaptive testing can and can't tell you, and how it compares to a clinical assessment.
ReadIQ Scores & Meaning
How scores are built, compared, and interpreted across a population.
A score without context is just a number. This track covers the machinery of interpretation: why the scale re-centers on 100 for every age group, how to translate a score into a percentile without fooling yourself, and what the research honestly says about the rare upper bands. For the full band-by-band reference, see the complete IQ score ranges guide.
How IQ changes with age
Why scores are age-adjusted, and how raw reasoning ability actually shifts across a life.
Read ReferenceReading your percentile
What "top 5%" actually means, and why small score differences matter less than people assume.
Read ReferenceGifted-range scores explained
What the research says about scores above 130, and what it doesn't.
ReadCognitive Domains
A closer look at each kind of reasoning AurorIQ measures.
AurorIQ reports a composite score, but the composite is built from distinct kinds of reasoning — and the differences between them are where the interesting cognitive science lives. These guides go domain by domain: what each one actually tests, how it's measured, and what it predicts outside the testing room.
What spatial reasoning really tests
Mental rotation, form, and why this domain predicts success in engineering and design.
Read Processing SpeedProcessing speed explained: why fast isn't simple
Why cognitive throughput isn't reaction time, and why speed without accuracy means nothing.
Read NumericalWhat numerical reasoning really tests
Quantitative reasoning, why it isn't the same as being good at maths, and how to score closer to your true ability.
Read PatternPattern recognition and fluid reasoning
What it means to "see the rule," and why it's so central to general intelligence.
Read MemoryWorking memory, explained
Why memory span is one of the strongest predictors in the cognitive science literature.
ReadImproving Cognition
What the evidence actually supports when it comes to sharpening how you think.
The internet is thick with promises to raise your IQ. The evidence is thinner. This track separates what reliably moves cognitive performance — sleep, stress, and testing conditions — from what mostly moves money, with a clear-eyed reading of the brain-training literature that respects both the hype's appeal and the data's verdict.