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Flynn has shown that there has been a standard deviation increase, per generation, in the mean level of intelligence test performance for most of this century in Western society, which equates to about three IQ points per decade. He believes that such a difference has to be the result of which one of the following? 
  • a)
    An environmental change, because gene frequencies in populations couldn't change so quickly. 
  • b)
    Improvements in the gene pool as we evolve. 
  • c)
    A statistical artefact. 
  • d)
    None of the above.
Correct answer is option 'A'. Can you explain this answer?
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Flynn has shown that there has been a standard deviation increase, per...
Such a difference has to be the result of an environmental change, because gene frequencies in populations could not change so quickly. If there can be shifts of one standard deviation in IQ between generations that are environmental in origin, despite the high heritability of IQ differences, why could there not be similar environmentally mediated differences between populations within the current generation?
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Flynn has shown that there has been a standard deviation increase, per...
Environmental Change
- Gene frequencies in populations cannot change rapidly enough to account for the observed increase in intelligence test performance over such a short period.
- The rapid increase in intelligence test performance is more likely due to changes in environmental factors such as nutrition, education, technology, and social conditions.
- These environmental changes have likely contributed to the cognitive development of individuals, leading to the observed increase in mean IQ scores over time.
Therefore, Flynn's assertion that the increase in intelligence test performance is the result of an environmental change rather than improvements in the gene pool or a statistical artefact is well-supported.
Community Answer
Flynn has shown that there has been a standard deviation increase, per...
Environmental Change Explanation:
1. Gene Frequencies: Gene frequencies in populations change very slowly over time and cannot account for the rapid increase in intelligence test performance observed by Flynn.
2. Environmental Factors: Environmental changes, such as improvements in education, nutrition, and technology, have a more significant impact on intelligence levels in a short period.
3. Three IQ Points Per Decade: The consistent increase of about three IQ points per decade aligns with societal advancements and changes rather than genetic evolution.
4. Flynn's Conclusion: Flynn's research supports the idea that environmental factors, rather than genetic changes, are responsible for the observed increase in intelligence levels over generations.
In conclusion, the most plausible explanation for the standard deviation increase in intelligence test performance per generation is an environmental change, as gene frequencies do not change rapidly enough to account for such a significant shift.
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Flynn has shown that there has been a standard deviation increase, per generation, in the mean level of intelligence test performance for most of this century in Western society, which equates to about three IQ points per decade. He believes that such a difference has to be the result of which one of the following?a)An environmental change, because gene frequencies in populations couldnt change so quickly.b)Improvements in the gene pool as we evolve.c)A statistical artefact.d)None of the above.Correct answer is option 'A'. Can you explain this answer?
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