mattnewport comments on Epistemic Luck - Less Wrong
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Try this: Choose a book that you expect to disagree with and read it from start to finish over several weeks. See what impact it has on you. I tried this and felt my beliefs changing despite none of the arguments being convincing. It seemed to peter out a few weeks after I finished the book. I hypothesize that in an extended experiment we could actually brainwash ourselves to the point of holding some radically different views.
The psychology research I'm aware of suggests the opposite effect if anything - reading opposing views tends to make you more sure of your original views. This is a feature of confirmation bias.
The study described in the link only exposed the subject to a single article. The effect might be different for different amounts of exposure.
In my own experience this seems to be the case. When I briefly read politically opposing blogs I find them so obviously stupid that I'm amazed anyone could take the other side seriously, but when I spend a long while doing it I find my views moderating and sometimes even crossing over despite not being convinced by any of their actual arguments, and begin to be embarrassed by figures I normally admire even though most of what I find directed against them are mere pejoratives. Then afterward the effect wears off. I could be unusually easily-led, but I've heard of enough other similar experiences that I doubt it.