Here are 5 possible theories to explain why intelligence seems to have hit a plateau in parts of Europe and the U.S.
The researchers gatheredAssessment Project, which was advertised online as a personality test. They measured several domains of cognitive ability, including matrix reasoning , letter and number series , verbal reasoning, and 3D rotation .
Results indicated a reversal of the Flynn Effect for composite scores of cognitive ability, matrix reasoning, and letter and number series when participants were grouped by age, education, and. In other words, there was a downward trend in these domains of cognitive ability over generations. Yet, performance on 3D rotations increased over time. The greatest differences were within groups of 18- to 22-year-olds as well as those without a college degree.
have suggested decreases in health in recent years, poor health is unlikely to explain the patterns in this study given that 3D rotation abilities actually increased.Given the different findings by domain, media exposure might be partially responsible. However, this explanation is currently speculative, as there is little experimental research on the effects of media exposure on intelligence.
Importantly, the researchers caution that cognitive ability scores may not actually be reflective of intelligence. In addition, there are several key limitations of the study. Participants self-selected into the study by finding it online, which could lead to differences in cohorts. Specifically, the authors mention that the personality test is now more popular and may thus include more “normal” people.
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