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Related Experiment Videos

The Flynn Effect revisited.

Elbert W Russell1

  • 1ewr@bellsouth.net

Applied Neuropsychology
|December 11, 2007
PubMed
Summary
This summary is machine-generated.

The Flynn Effect, or rising intelligence scores, may be plateauing in developed nations. In the US, data suggests average IQ scores have stopped increasing, potentially due to environmental optimization and genetic factors.

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Area of Science:

  • Psychology
  • Human Intelligence Studies
  • Behavioral Genetics

Background:

  • The Flynn Effect describes the observed rise in average intelligence test scores over time.
  • Environmental optimization in developed countries may lead to a plateau in cognitive abilities.
  • Genetic factors are hypothesized to become more influential as environmental influences diminish.

Purpose of the Study:

  • To examine evidence for a plateau in the Flynn Effect within the United States.
  • To analyze trends in adult Wechsler test scores to identify potential stagnation in IQ gains.
  • To assess the impact of environmental and genetic factors on long-term intelligence trends.

Main Methods:

  • Analysis of adult Wechsler test scores across different norming periods in the US.

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  • Statistical examination of the rate of increase in Full Scale IQ (FSIQ) scores.
  • Consideration of methodological factors, such as sample selection in test norming.

    • Main Results:

    • A significant reduction in the rate of FSIQ increase was observed between Wechsler test normings.
    • Projected plateau of average FSIQ in the US around 2024, based on recent trends.
    • The exclusion of subjects with potential brain impairment during WAIS-III norming may artificially inflate average FSIQ scores.

    Conclusions:

    • Evidence suggests the Flynn Effect may have reached a plateau in the United States.
    • The plateau is likely influenced by environmental saturation and the increasing role of genetics.
    • Methodological considerations in intelligence testing can impact the interpretation of long-term trends.