It is, however, within the medical mainstream as different populations really do have some differences and some of those traits do tend to follow ethnic/racial lines.PharaohMentuhotep wrote:This quote, especially the part in bold, raised red flags. The claim of race being a biologically meaningful concept when applied to human biological variation is outside the scientific mainstream.
I'm sorry if it upsets you, but the difference in twinning rate really does exist. Specifically, the Yoruba of Nigeria have the highest fraternal twinning rate in the world. The Chinese have the lowest. This has been confirmed by many sources, not just one. The personality and/or prejudices of someone does not alter whether the facts they present are valid or not.However the part in bold in particular about racial differences in gestation and twinning rates is an obvious reference to the research of J. Philippe Rushton, a psychology professor at the University of Western Ontario, Canada who wrote a controversial book titled Race, Evolution and Behavior: A Life History Perspective which is widely recognized in academia to be a promotion of Scientific Racism.
While I do not agree with Rushton using these facts to rank people, much of that chart contains valid data. Granted, there is also important information left out - one of the reasons that cranial capacity of his categories whites and orientals are so close is due to those populations being less variable in size. The blacks appear smaller, but that is an artifact of two things: Africans and those of African descent are much more variable in height than those of ancestry from other continents so you have to be careful because any random sample you use are may have enough smaller-than-global-average individuals that will, due to size alone, have a perfectly proportional but smaller crania (and you must also take care that your sample might have many taller-than-human-average individuals), and so many of the Africans and their diaspora live in sufficient poverty that stunted growth must be a factor taken into consideration. That's part of the problem of mixing data that's gene-based (as fraternal twin rate is believed to be) and environmental (which operates outside the genes), and failing to account for the fact that some traits are influenced by both.
In sum, while you can contest many of his "facts", some of which are clearly environmental and cultural and not genetic, you can not dismiss all of them as "products of a racist". I certainly encourage you to challenge the data, but you can not do that by attacking a person's viewpoint. (You can, of course, attack a person's conclusions if you think there is bias at work, which in the case of Rushton you clearly do)
From your quote from review of Rushton's book by evolutionary biologist Richard Lewontin:
Emphasis added - Lewontin is acknowledging that there are, in fact, "proven causal relations" and data in Rushton's book, the problem is that they are mixed in with speculations.Finally, like all works of its genre, Race, Evolution, and Behavior has a hard time distinguishing between speculations and proven causal relations.
Just in case anyone is wondering - the proven facts in that chart are the following:
-Fraternal twinning rate
-Possibly the cranial capacity although that is so variable among adult humans and various groups that without knowing the size of the sample used and the methodology it's essentially meaningless. On top of which, Rushton attempts to correlate this with intelligence as a stand in for brain size, likewise the bit on "cortical neurons", but that ignores medical science which see no correlation between brain size within the normal range and intelligence. Indeed, children with heads on the large end of the average scale are usually whisked off to medical testing for hydrocephalus, which is associated with mental retardation, and there are several disorders that result in too many cells in the brain rather than not enough. which also result in mental retardation, so perhaps what Rushton's chart is showing is that black people are less likely to suffer these disorders, even in mild and treated forms (hydrocephalus can be treated and intelligence preserved if caught early enough) than other peoples! So, while the data may be valid, the conclusions drawn from it may not be.
- At least in America, those of African descent are more like to deliver their children before 40 weeks of gestation. Whether that's a problem or not depends on how premature, and how late everyone else is delivering as going much past 40 weeks is also indicative of a problem. Those of African descent are also more likely to have babies that weigh less than average at birth. However, both of those numbers are definitely affected by the environment, and poor nutrition and stress are far more likely to have an impact that than genetics. If there is a genetic basis for this it's buried in environmental effects.
- The skeletal and dental data is true. Those of African descent go through the usual skeletal and dental growth stages slightly faster than Europeans, who do so slightly earlier than those from Asia (I keep noting the Americas are entirely left out of these discussions). What does it mean as far as better or worse? Absolutely nothing. What does the greater body hair of Europeans signify? Nothing. These are just variations, none of which have either sufficient detriments to be eliminated nor sufficient advantage to become universal. What use are the "shovel" shaped incisors common in Asia? So far as anyone can see they work as well as any other human teeth and confer neither advantage nor disadvantage. Rushton somehow concludes that these skeletal and dental traits result in a ranking of "races", that is where he is wrong, not in the existence of these traits. About the only "use" these traits have are, first of all, slightly adjusting the age at which an adolescent is sent for medical testing if not physically maturing as expected, and in forensic pathology slightly altering age estimates for corpses. Outside of those somewhat specialized area it's irrelevant.
The lifespan data are also true - at least once a year we hear that the Japanese are the longest lived people on Earth, and some African countries have horrifically low average lifespans. But this has more to do with Japan being a peaceful and prosperous nation and some of those African nations being embroiled in decades-long civil wars and/or lacking modern medical care. These are not inherent physical traits but environmental, social, and cultural ones. Africans who leave those civil war torn countries and move elsewhere will "suddenly" have much longer life expectancies. People of Japanese ancestry who live outside of Japan have life expectancies in line with their neighbors.
Everything else on that chart are environmental factors, not something inherent in genes or bodies. The inclusion of actual facts (particularly when divorced from context) gives an aura of respectability to such charts, but it's covering a lump of lead with gold leaf. Oh, yes, the gold leaf IS real gold.... but it's only a thin veneer over a much less pleasant lump.
Your Lewontin quote actuallly does do a pretty good job of explaining the issue with Rushton's work.
So, while I agree with you that Rushton is showing racism, I disagree that his data is wholly garbage. There's just enough valid information in with the bullshit to trip people up.