Psychology › Section G · Thinking and intelligence › Topic G.6
The source of intelligence
Why do people differ in measured intelligence? The honest answer is that genes and environments both matter, in ways that interact and change across life. This topic explains what twin and adoption studies show, what heritability does and does not mean, and how researchers interpret differences between groups.
In this topic
- Asking the right question
- Evidence from families
- What heritability means
- Worked example: reading twin correlations
- Heritability shifts with age and context
- Environments that move scores
- Group differences in scores
- Worked example: within versus between
- Controversy, courts and stereotype threat
- Learning disabilities are different
- Common mistakes to avoid
- Key takeaways
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