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The Flynn Effect is actually no longer observed. [0] There is a multi-decade IQ drop in multiple European countries with otherwise world-leading Education syst
by DoingIsLearning 5y ago
The Flynn Effect is actually no longer observed. [0]
There is a multi-decade IQ drop in multiple European countries with otherwise world-leading Education systems.
More interestingly the drop is also happening intra-family which defeats the initial theory of a dumbing down of the gene pool. Currently the best theory is that there is an environmental cause.
If I'm allowed to speculate my money is on diesel engine NO2 exposure [1], plasticizers [2], and flame retardants [3], probably in that order.
[0] https://edition.cnn.com/2018/06/13/health/falling-iq-scores-study-intl/index.html https://edition.cnn.com/2018/06/13/health/falling-iq-scores-...
[1] https://pubmed.ncbi.nlm.nih.gov/26426942/ https://pubmed.ncbi.nlm.nih.gov/26426942/
[2] https://pubmed.ncbi.nlm.nih.gov/25493564/ https://pubmed.ncbi.nlm.nih.gov/25493564/
[3] https://pubmed.ncbi.nlm.nih.gov/31952890/ https://pubmed.ncbi.nlm.nih.gov/31952890/
- vorpalhex 5y agoThis meta-analysis from 2014 disagrees: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4152423/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4152423/ The study underlying that CNN article only used three decades of data and only for Norwegian males. Also note that their cohort IQ delta is < 2 points across a decade which is well within error margin.
- DoingIsLearning 5y agoThe meta-analysis has an impressive methodology. However, it claims that the increase in IQ is pervasive across geography but if you look at the studies included, the majority of the data sampled is from the US. The Norwegian phenomenon is not exclusive it has been observed in the last few decades in Denmark, Britain, France, the Netherlands, Finland and Estonia.
- im3w1l 5y agoRandom mutations means that children are on average a little less fit than their parents.