Zachary_Kurtz comments on The things we know that we know ain't so - Less Wrong
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Kuhn's paradigm shifts deal with the problem of diffusing new scientific theories. But I think it's a different issue. Kuhn claims that paradigm shift is difficult because people on different sides of the shift speak in incommensurate terms, and so can't understand each other. In the case of Broca's/Wernicke's areas, there's no problem communicating between different paradigms or even vocabularies.
Kuhn may be wrong here.
If two people are speaking with the same terms, but using these terms to mean different things, it might be more difficult (not less) to accept new scientific data. Especially if such terms are highly associated with out-dated scientific 'facts.'
Whether or not a particular brain region is related to language function isn't close to the kind of thing that would be ignored because of the existing paradigm.