American Adults' IQ Scores Fall Up to 4.35 Points as Studies Point to Environmental Causes
Updated
Updated · spacedaily.com · Jun 10
American Adults' IQ Scores Fall Up to 4.35 Points as Studies Point to Environmental Causes
3 articles · Updated · spacedaily.com · Jun 10
Summary
A 2023 U.S. study of 394,378 adults found declines from 2006 to 2018 in three of four cognitive domains: verbal reasoning fell 4.35 points, matrix reasoning 2.85, and letter-number series 1.65.
The findings fit a broader reversal of the long-running Flynn Effect, which had lifted average IQ scores by about 3 points per decade across much of the 20th century before turning down in the mid-1990s.
Norwegian family-based research published in 2018 found younger generations scored lower than their fathers under the same testing conditions, pointing to environmental rather than genetic causes.
Researchers have not pinned down which factors matter most, with schooling changes, fragmented digital media use, pollution, sleep loss and test design all under debate; 3D spatial rotation was the only U.S. domain that improved.
The evidence does not show humans are biologically less intelligent, but it does suggest modern environments may be reshaping the abstract reasoning skills standard IQ tests capture.
If modern life is lowering IQs, what undiscovered factor is the main culprit we need to find?
Is humanity getting dumber, or is our intelligence just evolving for a digital world?
As abstract reasoning fades, which elite professions will face a future talent crisis?
America’s IQ Drop: Understanding the Causes, Impacts, and Solutions
Overview
This report highlights a significant shift in cognitive trends: after decades of rising intelligence test scores known as the Flynn Effect, U.S. average IQ scores have started to decline, especially among younger people. Researchers are actively discussing the causes and implications of this downturn, focusing on environmental factors rather than genetics. The decline marks a critical point for understanding how changes in education, technology, and mental health may be affecting cognitive abilities. Ongoing exploration aims to uncover the long-term consequences for society and education, emphasizing the need for strategies to support cognitive development and resilience.