Insights from the Dutch IQ Twin Study

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Sample in the Dutch IQ twin study

112 Dutch families with twins and a slightly older sibling.

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Test used to assess intelligence

Raven's Progressive Matrices (age-appropriate versions).

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Correlation between spouses' IQ scores

A significant positive correlation.

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Comparison of twins' IQ scores

There was a strong correlation between twin IQ scores.

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Effect of environment on IQ scores

Environmental impact was greater among individuals with lower IQ scores.

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Study's main conclusion about intelligence

Individual differences in IQ are largely due to genetic factors.

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findings

enviromennt affcted lower iq more

spousal correlation exisits

no cutral transmission