 Brian K. Hall also cites the long legs of humans as a peramorphic trait, which is in sharp contrast to neoteny.On the balance, an all or nothing approach could be regarded as pointless, with a combination of heterochronic processes being more likely and more reasonable (Vrba, 1996).Based on calculations that show that more complex gene networks are more vulnerable to mutations as more conditions that are necessary but not sufficient increases the risk of one of them being hit, there is a theory that mutagens in food cooked by human ancestors short of modern human intelligence that was more likely to be burnt than in modern cooking selected against complex gene networks.