Test scores among young men declined between 1998 and 2003/04.
Secular declines in cognitive test scores: A reversal of the Flynn Effect
Thomas W. Teasdale and David R. Owen. Intelligence, 36 (2008) 121–126.
Scores on cognitive tests have been very widely reported to have increased through the decades of the last century, a generational phenomenon termed the ‘Flynn Effect’ since it was most comprehensively documented by James Flynn in the 1980’s. We here report data from a population, namely young adult males in Denmark, showing that whereas there were modest increases between 1988 and 1998, scores on all four tests declined between 1998 and 2003/2004.