Is intelligence one thing or many? And what does a number like "IQ 115" actually mean? Tap through the major theories, then drag the slider to see how a score sits on the bell curve.
The many models of the mind
Tap a theorist to see how they picture intelligence.
Six ways to define intelligencetap one to explore
100
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Original formula: mental age ÷ chronological age × 100 (Stern, then Terman). Modern tests use a deviation IQ — your score compared with same-age peers, set to a mean of 100.