Outliers: The Story of Success · chapter 2 · id outliers-c2-04-ericssons-study-found-no-natur
“Ericsson's study found 'no naturals' who reached the top with less practice, and no 'grinds' who practiced heavily but failed to advance.”
CONTESTEDconfidence: high⚠ extracted by pipeline, re-audit pending
Receipts
Ericsson, Krampe & Tesch-Romer (1993), Psychological Review 100(3)DOI registry: valid
The 1993 study found a strong correlation between accumulated deliberate practice and group membership in their sample of 30 Berlin Academy violinists.
Campitelli & Gobet (2011), Current Directions in Psychological ScienceDOI registry: valid
Some chess players reached master level with ~3,000 hours while others never reached it despite 25,000+ hours. This directly contradicts the 'no naturals, no grinds' claim.
Mosing et al. (2014), Psychological Science -- Swedish twin study, N=10,500DOI registry: valid
Genetic factors explained a large proportion of both the propensity to practice and the level of ability achieved. Some twins who practiced less showed equal or better ability.
This claim is a stable, citable object. If you can falsify a verdict, tell us. Corrections are loud here.