Measuring intelligence and its correlates is a fundamental research endeavour in psychology which has attracted huge interest and no little controversy amongst scholars. It is vital therefore that claims about the relationship between intelligence and other variables are carefully established. This paper argues that KK's claim is theoretically suspect and that the evidence that is claimed to support it is, in fact, weak and inconclusive.What struck me when reading the recent paper is how little direct and strong evidence for a relationship between beauty and intelligence in adults exists. It is known, for example, that beautiful people make more money, that intelligent people make more money, but one can't conclude on the basis of these two facts that beauty and intelligence go together in the same individuals. Hopefully someone will study the issue of cognitive ability and beauty directly.
Beauty and intelligence may – or may not – be related
In a recent paper, [Kanazawa S. & Kovar J.L. (2004). Why beautiful people are more intelligent, Intelligence, 32, 227–243] assert that given certain empirical regularities about assortative mating and the heritability of intelligence and beauty, that it logically follows that more intelligent people are more beautiful. It is argued here that this “theorem” is false and that the evidence does not support it.