We have better idea now about what it measures. For example about 35% of differences in IQ scores are associated with working memory capacity. And we have very specific tests to measure working memory. There are more very specific parameters that are correlated with IQ that we can measure. We know quite well what IQ actually is but it’s a mix of many different things and not a simple parameter indicating who’s smart and who’s not.
We have better idea now about what it measures. For example about 35% of differences in IQ scores are associated with working memory capacity. And we have very specific tests to measure working memory. There are more very specific parameters that are correlated with IQ that we can measure. We know quite well what IQ actually is but it’s a mix of many different things and not a simple parameter indicating who’s smart and who’s not.