One Century of Global IQ Gains: A Formal Meta-Analysis of the Flynn Effect (1909-2013)

Pietschnig, J., & Voracek, M. (2015). One century of global IQ gains: A formal meta-analysis of the Flynn effect (1909-2013). Perspectives on Psychological Science

179 Pages Posted: 4 Mar 2014 Last revised: 26 Jan 2015

Jakob Pietschnig

University of Vienna - Department of Applied Psychology: Health, Development, Enhancement and Intervention

Martin Voracek

University of Vienna

Date Written: April 19, 2013

Abstract

The Flynn effect (rising intelligence test performance in the general population over time and generations) varies enigmatically across countries and intelligence domains; its substantive meaning and causes remain elusive. This first formal meta-analysis on the topic reveals worldwide IQ gains across more than one century (1909-2013), based on 271 independent samples, totaling almost four million participants, from 31 countries. Key findings include that IQ gains vary according to domain (estimated 0.41, 0.30, 0.28, and 0.21 IQ points annually for fluid, spatial, fullscale, and crystallized IQ test performance, respectively), are stronger for adults than children, and have decreased in more recent decades. Altogether, these findings narrow down proposed theories and candidate factors presumably accounting for the Flynn effect. Factors associated with life history speed seem mainly responsible for the Flynn effect’s general trajectory, whereas favorable social-multiplier effects and effects related to economic prosperity appear to be responsible for observed differences of the Flynn effect across intelligence domains.

Keywords: Flynn effect, meta-analysis, generational IQ gains, intelligence

JEL Classification: C10, I20

Suggested Citation

Pietschnig, Jakob and Voracek, Martin, One Century of Global IQ Gains: A Formal Meta-Analysis of the Flynn Effect (1909-2013) (April 19, 2013). Pietschnig, J., & Voracek, M. (2015). One century of global IQ gains: A formal meta-analysis of the Flynn effect (1909-2013). Perspectives on Psychological Science. Available at SSRN: https://ssrn.com/abstract=2404239 or http://dx.doi.org/10.2139/ssrn.2404239

Jakob Pietschnig (Contact Author)

University of Vienna - Department of Applied Psychology: Health, Development, Enhancement and Intervention ( email )

Liebiggasse 5
Vienna, 1010
Austria

Martin Voracek

University of Vienna ( email )

Universitätsstrasse 7
Vienna, Vienna 1010
Austria

Paper statistics

Downloads
353
Rank
66,118
Abstract Views
1,677