Humans have evolved specialized skills of social cognition: the cultural intelligence hypothesis.
Level 3 - non-randomized controlled study
Cross-sectional comparative study evaluating cognitive test battery performance across human and non-human primate cohorts.
PubMed 17823346 · doi:10.1126/science.1146282
What was done
Researchers administered a comprehensive battery of cognitive tests evaluating physical and social domains to cohorts of 2.5-year-old human children (prior to literacy and formal schooling), chimpanzees, and orangutans to test the cultural intelligence hypothesis against general intelligence models.
What was found
The abstract reports no numerical values, test scores, or statistical effect sizes. Qualitatively, 2.5-year-old human children and chimpanzees demonstrated very similar cognitive performance on physical-world tasks, whereas human children exhibited more sophisticated cognitive skills on social-world tasks compared to both chimpanzees and orangutans.
Why it matters
This study provides empirical support for the cultural intelligence hypothesis, suggesting that early human cognitive divergence from other great apes is driven by specialized social-cognitive adaptations rather than an across-the-board increase in general intelligence.
Limits
The abstract does not disclose exact sample sizes (describing them only as large numbers) and reports no quantitative test metrics or statistical values. It does not address potential species-specific testing biases, motivational differences, or variations in rearing and testing environments.
Cited by
- supports In comparative cognitive testing, 2-year-old human children perform similarly to chimpanzees and orangutans on physical IQ tasks, but significantly outperform them on social cognition tasks.