The different measures of IQ displayed in the figure correspond to different types of intelligence.Īlexander Luria, a Russian neuropsychologist, conducted a series of interviews with headmen of villages in rural 1920s Russia as part of a study of reasoning. For more information on the drivers and composition of IQ gains, see our section here As the visualization above it is only helpful for understanding changes over time. It is important to note that this is not a reflection of how intelligent a country/region is but instead how quickly advances were being made. The charts show the estimated gain in average IQ for a selection of countries and world regions. For the definitions of the different IQ measures presented in the chart click here. 2 The paper discusses several explanations for the observed increases, namely education, exposure to technology and nutrition. They find strong evidence to support the claim that IQ has been increasing substantially over time. In a comprehensive study of the Flynn Effect, Jakob Pietschnig and Martin Voracek looked at 271 independent samples comprising 3,987,892 participants covering a time span of 105 years (1909–2013).
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