One of the things found in all the research is that, since you can get emotional responses out, well, basically any kind of communication (languages you don't understand, noises, whatever,) you can argue that the degree of "understanding" you have of a language just allows it to trigger finer and more nuanced responses (expectation breaks, comedy, etc, all that.) The "problem" of something like serial music or any kind of music that is "random" sounding enough that it makes you default to basic responses is that it can't immediately engage you on the level of stuff that you're familiar with. This obviously changes drastically the more you expose yourself and familiarize yourself with different kinds of musical languages.
One thing that happens when you ARE familiar with the musical language, enough to have actual expectations, is that a curious things starts to happen which is that music that constantly breaks expectation is more "interesting," or "pleasurable" to listen to, but the break has to be just right. Too tame and it doesn't excite the brain centers enough, too harsh and it pulls you out of it. This kind of expectancy "curve" is what drives a lot of music composition from all sorts of people, Beethoven, Bach, you name it. They did it, obviously, purely on intuition, but we know now that they were "guided" by how the brain actually perceives those breaks in expectation. There's a lot to unpack in this theory, but I've been investigating this subject for the last 10 years, I think it's amazing how much we have discovered. Additionally, this can apply to any musical language, all it takes is enough consistency and familiarity to develop expectancy.
Here are two papers you can read that back up my statements:
http://www.stefan-koelsch.de/papers/Fritz_2009_CurrBiol.pdf
and
http://www.stefan-koelsch.de/papers/Koelsch_2008_ERAN_EDA_music_meaning_syntax_emotion.pdf
There are a bunch of other papers that go in depth into both things, usually with new studies and some new insight, but these are good starting points. You need to brush up on some neurology to really understand what's going on in the brain itself, but you can get a pretty good idea of what's going on even if you just look at the graphs.