Is the inequality of intelligence increasing?

“The inequality that matters,” as they used to say:

In a large US-representative adolescent sample, a Flynn Effect was found for IQs ≥ 130, and a negative effect for IQs ≤ 70

IQ changes also differed substantially by age group

A negative Flynn Effect for those with low intellectual ability suggests widening disparities in cognitive ability

Findings challenge the practice of generalizing IQ trends based on data from non-representative samples

So maybe yes — beware!

Here is the paper, via the excellent Kevin Lewis.