π Key takeaways
- In the mid-20th century, Raymond Cattell and his student John Horn divided general intelligence into fluid (Gf) and crystallized (Gc) components.
- Gf is the ability to reason, spot patterns and solve novel problems without relying on prior knowledge.
- Gc is accumulated knowledge, vocabulary and skills built through education and experience.
- It explains why fluid reasoning often peaks early while knowledge keeps rising, and it shaped the modern CHC model that organises todayβs IQ tests.
Who proposed the distinction?
In the mid-20th century, Raymond Cattell and his student John Horn divided general intelligence into fluid (Gf) and crystallized (Gc) components.
What is fluid intelligence?
Gf is the ability to reason, spot patterns and solve novel problems without relying on prior knowledge. It is what culture-fair, matrix-style tests aim to capture.
What is crystallized intelligence?
Gc is accumulated knowledge, vocabulary and skills built through education and experience. It tends to keep growing well into later life.
Why is the split useful?
It explains why fluid reasoning often peaks early while knowledge keeps rising, and it shaped the modern CHC model that organises todayβs IQ tests.
π§ Explore Intelligence
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Last updated: 2026-06-18 Β· β Reviewed by the All-Lifes editorial team Β· About Β· Methodology