Friday, June 10, 2016

How to study IQ when you are not studying IQ

The article below is a significant advance.  The authors bypass IQ tests and go straight to the genes behind it.  They show that a particular set of genes can give you the same sort of correlates as you get with IQ tests.  Once again smart people are shown to be advantaged in all sorts of ways.

The work is still at an early stage, however, as the correlations were much weaker than are found with IQ tests, indicating that only some of the relevant genes have so far been found and suggesting that some of the genes used were statistical "noise".  

There are by now a few comments about the study online, all of which are remarkably tight-assed.  They do their best to play  the findings down.  Put in the context of previous IQ studies, however, the findings are powerfully confirmatory of the pervasive importance of IQ -- vastly unpopular though that fact may be

The final sentence below is sheer nonsense -- added for the sake of political correctness only.

The Genetics of Success: How Single-Nucleotide Polymorphisms Associated With Educational Attainment Relate to Life-Course Development

Daniel W. Belsky et al.


A previous genome-wide association study (GWAS) of more than 100,000 individuals identified molecular-genetic predictors of educational attainment. We undertook in-depth life-course investigation of the polygenic score derived from this GWAS using the four-decade Dunedin Study (N = 918). There were five main findings. First, polygenic scores predicted adult economic outcomes even after accounting for educational attainments. Second, genes and environments were correlated: Children with higher polygenic scores were born into better-off homes. Third, children’s polygenic scores predicted their adult outcomes even when analyses accounted for their social-class origins; social-mobility analysis showed that children with higher polygenic scores were more upwardly mobile than children with lower scores. Fourth, polygenic scores predicted behavior across the life course, from early acquisition of speech and reading skills through geographic mobility and mate choice and on to financial planning for retirement. Fifth, polygenic-score associations were mediated by psychological characteristics, including intelligence, self-control, and interpersonal skill. Effect sizes were small. Factors connecting DNA sequence with life outcomes may provide targets for interventions to promote population-wide positive development.

Psychological Science June 1, 2016.  doi: 10.1177/0956797616643070

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