📌 Key takeaways
- In the 1930s Louis Thurstone identified about seven primary mental abilities — including verbal comprehension, numerical ability, spatial visualisation, memory, reasoning, word fluency and perceptual speed.
- Thurstone initially argued these abilities were independent, suggesting intelligence is multidimensional rather than a single general factor.
- Later analysis showed his primary abilities still correlate, pointing back to a higher-order g.
- Thurstone’s work shaped factor analysis and the idea of distinct group abilities that sit beneath general intelligence.
What did Thurstone propose?
In the 1930s Louis Thurstone identified about seven primary mental abilities — including verbal comprehension, numerical ability, spatial visualisation, memory, reasoning, word fluency and perceptual speed.
How did this challenge g?
Thurstone initially argued these abilities were independent, suggesting intelligence is multidimensional rather than a single general factor.
Did the debate resolve?
Later analysis showed his primary abilities still correlate, pointing back to a higher-order g. Modern hierarchical models include both levels.
What is his legacy?
Thurstone’s work shaped factor analysis and the idea of distinct group abilities that sit beneath general intelligence.
🧭 Explore Intelligence
📅 Last updated: 2026-06-18 · ✔ Reviewed by the All-Lifes editorial team · About · Methodology