The Flynn effect, group differences, and g loadings

Flynn effect gains are predominantly driven by environmental factors. Might these factors also be responsible for group differences in intelligence? Group differences in intelligence have been clearly shown to strongly correlate with g loadings. The empirical studies on whether the pattern of Flynn effect gains is the same as the pattern of group differences yield conflicting findings. We present new evidence on the topic using a number of datasets from the US and the Netherlands. Score gains and g loadings showed a small negative average correlation. The general picture is now that there is a small, negative correlation between g loadings and Flynn effect gains. It appears that the Flynn effect and group differences have different causes.

► Are the causes of the Flynn effect the same as causes of group differences? ► We used a number of datasets from the US and the Netherlands. ► There is a small negative average correlation between score gains and g loadings. ► It appears that the Flynn effect and group differences have different causes.