Welcome to the site! I’m very curious to see what you, as a psychology major, find out as you use the pheromones.
I am pretty new myself and I find them to be quite effective. I have used MX135 (which is very yummy), IH, IS, IS/b, IO. I just love the IH, and wear it quite often. I just makes ME feel good and makes people around me more pleasant. The IS/b made me depressed, at least I think it was that. I have to try it one more time to see for sure. I do love IS/a though. So far the best combo I’ve found is the IS/a and the MX135. I posted about it in my diary at Dragonfly's Diary
Keep us posted on your findings! I’m very, very curious.