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A persistent misunderstanding both in the world of HBD and general medical and psychological science at large is the notion of what constitutes a "disorder." When does a phenotype represent a physiological or behavioral malady? For behavioral issues, most people regard the Diagnostic and Statistical Manual of Mental Disorders (DSM) as the "final word" on... Read More
Post updated, 10/21/14. See below! It's general trope in the HBD community: people are getting dumber. The low IQ are outbreeding the high IQ, leading to a slow decline in genetic intellectual potential in the population. Indeed, my own analyses seem to have shown that there was a fair fertility advantage among the lower IQ... Read More
Can be quite substantial. Jump off the Empire State Building and see for yourself. But, beyond that, the question remains how much of the variation in health outcomes and longevity can be explained by behavioral variation? Well, we don't quite know. But we do have evidence which indicates that – at least in the developed... Read More
Updated, 10/17/15. See below! In this post, I will review Gregory Cochran's "gay germ" hypothesis. I wanted to make an index of Cochran's posts from his and Henry Harpending's blog West Hunter that discuss it. These posts don't seem to all show up under the "Homosexuality" category there, and I wanted links to them to... Read More
Previously, I intimated that the connection between obesity and cardiovascular disease and death from such diseases may not be what is commonly believed: The idea is that people who are in poorer health have all around poorer genetic quality – in other words, they tend to have higher levels of genetic load (see here at... Read More
Greg Cochran and Henry Harpending have recently proposed a hypothesis on their blog that posits that the lower average IQ of tropical peoples may be related to the number of fitness reducing mutations these people carry. Apparently, the rate of mutation is higher in the tropics. The majority of mutations that occur are neutral and... Read More
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