Neel did have a theory of the evolution of what is now often called "social intelligence" (Byrne
1995 ). He argued that since headmen were often highly polygynous they differentially passed their genes to the next generation. If some heritable attributes were associated with headmanship (Neel avoided calling this "intelligence," since it included much more than IQ), then the differential fertility consequent on polygyny would increase their frequency through time. The set of characteristics, due to many genes at many loci, was very close to that specified in the social intelligence model (see Neel
1994 :186–and included knowledge of tribal history and law, the ability to speak persuasively, and being skilled in battle and the hunt. This model is simply a description of natural selection for polygenic traits the outcome of which is an increase in gene frequencies for social intelligence in the population as a whole. It is surely possible to argue about whether this model applied to the Yanomami or more widely, but it is not by itself a "eugenic" model or necessarily evil. However, in the hands of Tierney this model is transmuted into the "leadership gene," which is "located at paired alleles" (whatever that might mean) and "concentrated in the offspring of dominant, polygynous chiefs" (p. 40) and is characterized as reflecting "quirky ideas about hierarchies of violence and genetic selection" (p. 13).