Exceptional cognitive ability: the phenotype.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing findings from longitudinal cohort studies
PubMed 19424784 · doi:10.1007/s10519-009-9273-0
What was done
This review evaluates multi-decade longitudinal follow-up data from talent searches of intellectually precocious adolescents (spanning the top 1% to the top 0.01% of cognitive ability) to describe developmental trajectories and life outcomes associated with exceptional cognitive phenotypes.
What was found
The abstract reports no numerical data, effect sizes, or exact statistics. It qualitatively reports that early cognitive ability levels and specific ability patterns (such as mathematical versus verbal reasoning) differentiate outcomes in adulthood, including rates of doctoral degree attainment, high compensation, publication of novels, patent acquisition, and tenure at top universities, even when comparing the top 1 in 100 with the top 1 in 10,000.
Why it matters
It highlights that intellectual ability does not show a ceiling effect for real-world achievement within the top 1%, arguing that behavior genetics should investigate extreme-ability groups to understand specific cognitive etiology.
Limits
The abstract contains no quantitative metrics, effect sizes, or study counts. Findings derive from observational talent-search cohorts, which may be subject to selection bias, and the abstract does not report controls for socioeconomic background, access to educational opportunities, or non-cognitive personality traits.
Cited by
- contradicts The long-term adult life outcomes and achievement of child prodigies are generally not exceptionally impressive.