I'm not sure, it seems obvious to me - words have connotations for those familiar with them that go beyond their literal meanings, and I tend to go with the hypothesis that language defines our thought process. (I'd call it cognitive linguistics, because that's the sensible thing to call it, but I think that somebody else already defined that phrase to refer to something less sensible.)
But I have one caveat. Less biased doesn't necessarily mean either better or more rational. Our decision making processes aren't optimized, nor should they be, for laboratory environments.
I believe linguistic relativity and Sapir-Whorf Hypothesis are the usual names for this idea. I also believe it's been mostly discredited in linguistic circles, but it's been a while since I talked about it with a linguist, so you should do your own research.
Paywalled article (can someone with access throw a PDF up on dropbox or something?): http://pss.sagepub.com/content/early/2012/04/18/0956797611432178
Blog summary: http://bps-research-digest.blogspot.co.uk/2012/06/we-think-more-rationally-in-foreign.html