Ten ways to think. One map.
A simple picture of the CHC model and what genes add.
Built on the Arc of Self.
Give a thousand people ten different tests. The ones who do well on one tend to do well on the others. That overlap has a name, g. It is not an organ in the head. It is a pattern in the scores, and it covers about half of what separates people.
"Half of the difference is shared. The other half is yours."
The CHC model is the map most IQ tests are built on today. Top floor: g, the shared part. Middle floor: ten broad abilities, from reasoning to hearing. Ground floor: the narrow skills a test can measure directly, like holding digits in your head or hearing a wrong note.
"A test measures the ground floor and guesses the rest."
Space is rotating a shape in your head. Hearing is catching a wrong note or keeping a beat. Speed is comparing symbols fast. None of these is a grade on you. Each is one small action a test can time.
"Nobody is strong at everything on this floor. Nobody."
The number in the corner is heritability: how much of the difference between people, in a group, twin studies trace to genes. Math and speed sit near 64 percent. Hearing and reasoning near 40. Solid numbers come from a meta-analysis of 77 studies. Outlined ones come from single studies. A dashed corner means nobody has measured it.
"Heritability says how much a group varies by genes. It says nothing about which half of you is fixed."
The average profile is even. Real people are not. One person reads the world by sound, another by shape. The abilities grow from a shared root and still come out uneven. The bet is simple: find the type of data you handle best, early, and build on that instead of on a test score.
"The score is the average of you. You are not an average."
Every percentage here describes thousands of twins, not you. Heritability rises with age because adults pick their own environments. A test taken online at midnight measures that night. The map answers its own question well: which skills travel together, and how much of that families pass on. Who you are is not on it.
"Use the map. Don't live in it."