Thursday, August 18, 2011

Blacks, dopamine, and IQ

In this new study in Intelligence, Add Health Study data is used to compare the average level of dopamine-related alleles among students of 36 different middle and high schools. This measure is strongly associated with lower mean IQs (Beta = -.47). The relationship is weakened substantially (to Beta = -.35) when the percent of the school that is black is added as a control in the OLS regression model.

What's the interpretation of this in plain English?  It is this: Some schools have a higher percent of students with genes associated with a low IQ. These schools tend to have a low average IQ. So one important cause of low-IQ schools is having more kids with the bad genes. What the percent black predictor tells us is that: 1) schools with more blacks tend to have more students with the at-risk genes; 2) schools with a higher percent of blacks have lower intelligence levels; and 3) evidently an important reason why some schools are smarter than others is due to having fewer blacks--a group which has a higher prevalence of the bad genes.

This study contradicts the view that: 1) race is a social construction, and 2) the black-white gap in IQ has nothing to do with differences in genes.


  1. Anonymous9:07 PM


    It's stupid to refer to bad schools instead of bad students.

    Bad students make bad schools.

  2. It's feasible that your service provider will charge you for failed faxes, and some will even charge to have a failed fax resent. But, we used to do much more and never had printers run out of toner as fast as this one does; even when we use economy settings. A standard fax machines used on offices are known as group 3 facsimile. Installation of effective system is highly essential as time and cost both are most important factor for business and managing it timely is tough without all technologically updates resources and applications.

  3. Anonymous8:04 PM

    "...the associations between dopaminergic
    genes and individual-level IQ scores were either small and statistically significant or non-significant."

    There are many troubling gaps in the methodology that the authors used to draw these conclusions. School quality is not held constant, and therefore the quality of education could vary widely. This is a glaring problem when measuring IQ using a test like the PVT. Therefore, all this study has done is confirm that greater genetic variation exists where there is more racial variation. Fascinating.


Allelic variants found only in populations of African ancestry predict kidney disease and preeclampsia in blacks

Study Link Black women in the United States and Africa are at an increased risk for preeclampsia. Allelic variants in the gene for apolip...