HaydnB, there are bits and pieces about the ways in which we changed animals in "The Eternal Child", a controversial book on neoteny. It deals more with 'what is a possible change direction' doable by artificial selection. You can adapt for cog enhancers.

I have a request that is sufficiently related that I'm unsure it would even qualify as off-topic: I'm looking for good things on enhancement towards childish, or neotenic, features.
It can be human or animal (dogs and other pack animals domestication for instance) The final purpose of my quest is to get more information for a Masters on whether it is a good or a bad idea to make humans more childlike then they already are. So I'm both interested in facts about how childlike we already are, and theoretical exploration of the pros and cons of making us even more.