This mental model explores the Flynn Effect, a phenomenon describing the consistent rise of IQ scores over the past century.
James Flynn, a New Zealand-based political scientist, observed a regular, substantial, and long-term increase in intelligence test scores measured in many parts of the world. This increase was steady and did not seem to be influenced by genetic factors. For instance, data signifies that the average IQ scores on certain tests have increased by approximately 3 points per decade in the U.S. Flynn's research suggests that this increase is due to changes in our surroundings, including schooling and better nutrition. A model for understanding this phenomenon could involve variables such as education, health, and societal changes. It highlights the significance of environment in intelligence development.
"The IQ gains of the 20th century have faltered. A range of studies using a variety of tests and groups of people find declining IQ scores across Scandinavia, Britain, Germany, France and Australia." - James Flynn
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