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How Much Does Education Improve Intelligence? A Meta-Analysis.

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Summary
This summary is machine-generated.

A meta-analysis found that each additional year of education increases intelligence by 1-5 IQ points. This robust effect on cognitive abilities persists throughout life, making education a powerful tool for cognitive enhancement.

Keywords:
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Area of Science:

  • Cognitive Psychology
  • Educational Psychology
  • Behavioral Genetics

Background:

  • Intelligence test scores and educational attainment show a positive correlation.
  • This correlation is ambiguous, with two possible interpretations: higher intelligence leads to more education, or education enhances intelligence.

Purpose of the Study:

  • To meta-analyze quasi-experimental studies on the causal effect of education on intelligence.
  • To quantify the impact of additional years of education on cognitive abilities.

Main Methods:

  • Meta-analysis of 142 effect sizes from 42 datasets (>600,000 participants).
  • Included quasi-experimental designs: controlling for prior intelligence, instrumental variables (compulsory schooling), and regression-discontinuity (school-entry age).

Main Results:

  • Consistent evidence for beneficial effects of education on cognitive abilities.
  • An average increase of 1-5 IQ points per additional year of education.
  • Effects were observed across the lifespan and on all major cognitive ability domains.

Conclusions:

  • Education is a robust and durable method for enhancing intelligence.
  • Findings support the hypothesis that education causally increases cognitive abilities.
  • This research provides strong evidence for the cognitive benefits of schooling.