Recommended reading on the ethics of Animal Cognitive Enhancement

Does anyone have recommendations of good things to read on the ethics of animal cognitive enhancement? By this I mean applying various methods of human cognitive enhancement (pharmacological, technological, etc) to animals such as the Great Apes. I’ve also heard this referred to as ‘up-lifting’ an animal.

I’m looking for articles, books, lectures—anything really. Obviously one can just google this but I find getting recommendations from others a better bet. I think this may be a useful resource for other people interested in the same topic. Interesting issues might include:

- Possible obligations to enhance

- Possible negative consequences

- Possible side-effects (such as radically different perspective)