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Sample in the Dutch IQ twin study
112 Dutch families with twins and a slightly older sibling.
Test used to assess intelligence
Raven's Progressive Matrices (age-appropriate versions).
Correlation between spouses' IQ scores
A significant positive correlation.
Comparison of twins' IQ scores
There was a strong correlation between twin IQ scores.
Effect of environment on IQ scores
Environmental impact was greater among individuals with lower IQ scores.
Study's main conclusion about intelligence
Individual differences in IQ are largely due to genetic factors.
findings
enviromennt affcted lower iq more
spousal correlation exisits
no cutral transmission