| Sumario: | Following the realization that the north-western dialect continuum of Catalan is splitting along the political border between Catalonia and Aragon, in Spain, this article upholds the view that internal borders should be incorporated into border studies, since they often trigger processes of linguistic convergence and divergence which alter the most common patterns of linguistic diffusion. The language change is analysed in apparent time using a combination of dialectometric techniques that constitute an innovation within the field of border effects, and which, in the specific case of Catalan in Aragon, illustrates the usefulness of dialectometry in detecting processes of structural hybridization in areas where the vitality of the language is most seriously undermined. Lastly, this article evinces the need to further develop a form of social dialectometry that not only answers sociolinguistic questions, but also makes it possible to objectively evaluate the social motivations fuelling the ongoing changes.
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