The 20th Century’s Flynn Effect of rising raw scores on IQ tests is, of course, very interesting. But what’s been happening lately?

From Personality and Individual Differences Volume 114, 1 August 2017, Pages 69–72

Rather far into the future …

A Negative Flynn Effect in Kuwait: The same effect as in Europe but with seemingly different causes Edward Duttona, , , Salaheldin Farah Bakhietb, , Yossry Ahmed Sayed Essab, , Tahanei Abdulrahman Muhammad Blahmarb, , Sultan Mohammed Ahmed Hakamib Highlights • Negative Flynn Effect in Kuwait among 8 to 15 year olds • Loss of 6.2 points per decade on SPM • Greater a losses among older age cohorts • Consistent with dynamics of religion-inspired changes to education system Abstract: The results of two previously published Arabic language administrations of the Standard Progressive Matrices (SPM) are compared. The first is an administration of the SPM in 2006 to a probability sample of 6529 Kuwaitis aged between 8 and 15 from all regions of Kuwait. The second is an administration to a comparable sample of 6431 Kuwaitis in 2015. We find a significant Negative Flynn Effect in each age cohort and an overall Negative Flynn Effect amounting to a loss of 6.2 points in a decade. Possible reasons for this are discussed. It is proposed that the most persuasive explanation is increasing religious emphasis in the Kuwaiti school curriculum.

On the other hand, from Intelligence in 2013:

An increase of intelligence in Saudi Arabia, 1977–2010

Adel A. Batterjee, Omar Khaleefa, Khalil Ali, Richard Lynn Received 13 August 2011 Normative data for 8–15 year olds for the Standard Progressive Matrices in Saudi Arabia were obtained in 1977 and 2010. The 2010 sample obtained higher average scores than the 1977 sample by .78d, equivalent to 11.7 IQ points. This represents a gain of 3.55 IQ points a decade over the 33 year period.

So, Kuwait down, Saudi Arabia up …

Has anybody done a meta-analysis of the Flynn Effect lately?