Reading Literary Fiction Improves Empathy (2013)
theguardian.com
theguardian.com
...and so on. The usual stuff.
I mean, it is pretty interesting that it works with fictional characters—but still: nothing I read in the article lead me to believe this is due to some elusive quality of the intentionally undefined category 'literary.' If anything, these results give a little more info. on how we actually do define 'literary': that a typical requirement for a work to be called 'literary' is that it pushes readers to model mental states of characters.
In this case, the authors contrasted "literary fiction" with nonfiction, "popular fiction" and nothing. The literary fiction samples were drawn from a PEN/O Henry prize 2012 winners' anthology and the US National book awards finalists. The examples of popular fiction consisted of a Danielle Steele novel, "Gone Girl" by Gillian Flynn, and know knows what, although one of the authors mentioned "...genre fiction like adventure, romance and thrillers."
Not much more in the abstract. http://www.sciencemag.org/content/342/6156/377.abstract