One thing to add: it is possible to get research to count from Brutes with Elite Brutes. I didn't have enoguh research and it worked to get to level four. So reaserhing Elite Brutes work also which are in Persephone.
One Question: I had full research complete for all EXCEPT the Big Sister. So on my next playthrough do I have to do it all over again or can I just reaarch the Big Sister and it will rememeber that I already researched the others like in the first Bioshock...?
^Thanks to SeedyEvil for the Sig^