I can back this up, anecdotally of course. I've read tons of fiction all my life, from literary classics to genre novels of all kinds, and I think it's helped me tremendously.
http://www.wsj.com/articles/reading-fic ... 2?mod=e2fb
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"We are fast approaching the stage of the ultimate inversion: the stage where the government is free to do anything it pleases, while the citizens may act only by permission – which is the stage of the darkest periods of human history, the stage of rule by brute force." – Ayn Rand