Apologies for not posting anything recently. I have something in the works at BigThink and a few more in the pipeline but it has been hard finding the time to blog recently. I hope to be back to it in a couple of weeks.
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What if we’ve been thinking about the genetics of intelligence from completely the wrong angle? Intelligence (as indexed by IQ or the general intelligence factor “ g ”) is clearly highly heritable in humans – people who are more genetically similar are also more similar in this factor. (Genetic variance has been estimated as explaining ~75% of variance in g , depending on age and other factors). There must therefore be genetic variants in the population that affect intelligence – so far, so good. But the search for such variants has, at its heart, an implicit assumption: that these variants affect intelligence in a fairly specific way – that they will occur in genes “for intelligence”. An implication of that phrase is that mutations in those genes were positively selected for at some stage in humanity’s descent from our common ancestor with apes, on the basis of conferring increased intelligence . This seems a fairly reasonable leap to make – suc...
Mental illness is surprisingly common. About 10% of the population is affected by it at any one time and up to 25% suffer some kind of mental illness over their lifetime. This has led some people (many people in fact) to surmise that it must exist for a reason – in particular that it must be associated with some kind of evolutionary advantage. Indeed, this is a popular and persistent idea both in scientific circles and in the general public. (See the recent article “ Depression’s Upside ” from the New York Times Magazine, for example). Such theories come in two main varieties – the first, that mental illness confers some specific advantage to those afflicted; and second, that the mutations which cause mental illness in one person’s genetic background may confer an advantage when they are in a different genetic background (balancing selection). Both of these suffer from some misconceptions about how evolution by natural selection works. The intuitive appeal of the “survi...
There is no such thing as a male brain, or a female brain. Instead, our brains are all really a mosaic of male and female parts – we all have an “intersex” brain. This is the claim made by psychologist Daphna Joel and colleagues, based mostly on a 2015 neuroimaging study in humans, but also some previous work in rodents. This idea – especially the catchy phrasing – has caught the public imagination and it has been widely covered in the media. Indeed, a recent editorial in Scientific American, entitled “ The New Science of Sex and Gender ”, cited this study as support for the view that “ To varying extents, many of us are biological hybrids on a male-female continuum ”. But what do the data actually show? I will argue below that the interpretation of a male-female mosaic is conceptually mistaken and based on a straw-man argument. I’ve discussed these findings and their interpretation before, as an illustration of how the same data can be used to suppo...
Looking forward to seeing your BigThoughts :)
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