IIF Certified Assessment
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IIF Certified Assessment
Cognitive science, testing standards and the numbers behind them — written for a general reader, with every score carrying the scale it was measured on and the range around it.
AI & Machine IntelligenceHeadlines call it an AI intelligence score. It is a weighted average of ten separate evaluations, and the hardest one — an exam built to resist quick solving — is already close to 60% solved.
A syllogism gives you two statements and asks what must follow. Decades of research show most people answer with what they already believe instead — and the fix is one simple substitution trick.
A WISC-V report does not hand back one score. It hands back six — and the headline Full Scale IQ is built from a specific seven of ten subtests, not an average of all five indexes.
Nearly every "IQ by profession" chart online traces to one 1945 study of wartime enlisted men, scored on a scale that is not even the one modern IQ tests use. Here is the real table — and what still holds up.
When a large Florida district began testing every second grader instead of waiting for a teacher's nomination, the population it identified as gifted changed sharply — not because more students became capable, but because fewer of them had ever been tested at all.
A full-scale IQ is not one thing a test measures directly. It is a composite built from several index scores, and the theory that decides which ones is called Cattell-Horn-Carroll — CHC for short.
Large longitudinal studies find verbal memory scores dip, on average, during the menopause transition — then recover for most women afterward. Online discussion of "menopause brain fog" usually keeps only the first half of that finding.
A cognitive ability test can produce pass rates eight points apart across two groups and clear federal guidelines. Another test can produce an eleven-point gap and fail the same screen. The difference is a ratio, not a point spread — and it is worth calculating yourself.
Four items share a rule and one breaks it, but only if that rule is the only sentence that fits. When a second, equally valid rule points at a different item, the puzzle is testing which distractor you noticed first, not how well you reason.
The idea that everyone leans on one dominant hemisphere — logical on the left, creative on the right — traces back to a real, Nobel Prize-winning discovery. It is not what that discovery found.
Each desk covers a subject we can report on continuously and check against a source. Pick the one you care about — or read everything.
New peer-reviewed findings on how reasoning, memory and general ability actually work — reported with the sample size and the error bars.
Sleep, exercise, diet, illness, medication and environment — what each one measurably does to thinking, and by how much.
How machine reasoning is measured, where it beats people, where it still fails, and what any of it says about human intelligence.
Admissions exams, gifted programs, national score reports and school testing policy, explained without the spin from either side.
The cognitive and aptitude tests employers use, how they are scored, and what a score does and does not predict at work.
Chart-led pieces on how scores are distributed across countries, states, ages, jobs and education levels — always with the caveats attached.
What a specific number means on a specific scale, why every score needs a confidence range, and how the scales convert.
Viral IQ claims checked against the record: where the number came from, who repeated it, and what is actually documented.
A reasoning puzzle every day with the full working shown, plus honest coverage of what brain-training products can and cannot do.
A full-scale IQ is not one thing a test measures directly. It is a composite built from several index scores, and the theory that decides which ones is called Cattell-Horn-Carroll — CHC for short.
Cognitive tests correlate less strongly with each other among high scorers than among low scorers. If that holds, a single full-scale figure carries less information the higher it goes — and the evidence for it is real but smaller and shakier than the idea's popularity suggests.
Savant syndrome pairs an ordinary or low Full-Scale IQ with one narrow ability that is exceptional, and it is the clearest case for why the index profile matters more than the total.
Large longitudinal studies find verbal memory scores dip, on average, during the menopause transition — then recover for most women afterward. Online discussion of "menopause brain fog" usually keeps only the first half of that finding.
The Lancet Commission ranks hearing loss as the largest single modifiable risk factor for dementia in midlife. It is also the most under-recognised way to depress a score on a test that is read aloud — two different problems that are easy to confuse.
Research presented at a European neuroscience meeting in July 2026 used magnetic brain recordings to estimate biological brain age, and found multilingual speakers scoring years below their calendar age. The gradient is striking. The design cannot show that languages caused it.
An IQ figure is meaningless without the scale it was measured on and the range around it. Every story here reports all three, or says plainly that the source did not.
Each story ends with the studies, datasets and documents it draws on, named and attributed, so you can go and read them yourself.
Spotted an error? Write to corrections@iqmetrics.org. Corrections are made on the story and noted at the bottom of it — never quietly.
Our IIF-certified assessment reports your score with its scale, percentile and confidence range — and a breakdown of the cognitive domains behind it.
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