Abstract:
:Population intelligence quotients increased throughout the 20th century-a phenomenon known as the Flynn effect-although recent years have seen a slowdown or reversal of this trend in several countries. To distinguish between the large set of proposed explanations, we categorize hypothesized causal factors by whether they accommodate the existence of within-family Flynn effects. Using administrative register data and cognitive ability scores from military conscription data covering three decades of Norwegian birth cohorts (1962-1991), we show that the observed Flynn effect, its turning point, and subsequent decline can all be fully recovered from within-family variation. The analysis controls for all factors shared by siblings and finds no evidence for prominent causal hypotheses of the decline implicating genes and environmental factors that vary between, but not within, families.
journal_name
Proc Natl Acad Sci U S Aauthors
Bratsberg B,Rogeberg Odoi
10.1073/pnas.1718793115subject
Has Abstractpub_date
2018-06-26 00:00:00pages
6674-6678issue
26eissn
0027-8424issn
1091-6490pii
1718793115journal_volume
115pub_type
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