(a) a race-IQ HH could readily be falsified by showing an absence of a correlation between genomic race and IQ
(b) some research teams must have looked at admixture-IQ data
(c) a non-association would have been published if it was found
(d) yet no results have been published
But has anyone bothered to email around for results? I just came across the following, for example:
Akshoomoff, et al. (2014). The NIH Toolbox Cognition Battery: results from a large normative developmental sample (PING). Neuropsychology, 28(1).
Estimating the effects of sociocultural factors within a highly diverse sample such as PING is challenging. The multi-site design produced a sample in which participants came from many different ethnic communities and many had mixed backgrounds. Because genotype information was available for the PING participants, we chose to use a set of genetically derived estimates of racial ancestry to estimate effects that could reflect differences in sociocultural background...To examine and control for the influences of race/ethnicity on test performance, genetic ancestry factors (GAFs) were calculated to estimate the proportion of European, African, American Indian, East Asia, Central Asia and Oceania ancestry for each participant, based on genotype analysis (methods detailed below)...The second model included the two separate SES variables (i.e., parental education and household income) in addition to the base model; SES variables considered were highest education of the parents and annual family income, both added as linear terms. The third model added genetic ancestry factors (GAFs) as linear terms. For each pair of nested models we computed R-squared statistics and performed chi-square tests to determine whether the added terms represented a significant contribution over and above the terms already in the model...The addition of genetic ancestry factors (GAFs) to the base+SES accounts for an additional .5% to 1% of the variance over and above SES for most NTCB scores, except for Vocabulary, for which it contributes an additional 2.3%.
The authors found the genomic ancestry explained some cognitive variance (about as much as SES); however, they didn't mention if it did so independent of social racial identity. Undoubtedly, they checked -- they didn't look at the association between genomic and social race, let alone use an index of genomic race in the first place, for nothing.
My question though is: Has anyone bothered to just ask? (In this case: Was genomic ancestry an independent predictor of cognitive ability when taking into account social identity?)