Maybe I'm misunderstanding the study, but it seems like they took half the group that preferred music and combined them with half the group that preferred silen

Maybe I'm misunderstanding the study, but it seems like they took half the group that preferred music and combined them with half the group that preferred silence and put that group in either a silent of musical room. It would be interesting to look at the breakdown of performance for each group, in each room. It's possible that those who had a preference for music in the silent room had a -20% hit in performance while those who had a preference for silence in silent room had a +20% boost in performance. What I'd like to know is if someone with a preference for music performs better/worse/equivalent in a room with/without music.