This article discusses explanations behind theory choice, that is, ultimately, what leads people to accept a certain claim as valid. There has been a recent debate as to how closure was achieved in the continental-drift discussion. The controversy had found its usual explanation under rationalist terms: Wegener’s 1912 continental-drift theory was accepted 50 years later only after the plate tectonic theory had provided more evidence or a more in-depth problem-solving capacity. Nevertheless, a re-examination of the controversy under constructivist terms argued (...) that closure was achieved by a change in the style of thought. This analysis prompted some authors to react calling to a ‘defence of rationalism’ and insisting on explaining that the continental-drift theory was only accepted because of epistemic reasons. As the debate impacts on the way to explain scientific controversies, in this article I analyze rationalist and constructivist approaches with respect to ways to explain the social acceptance or rejection of a theory. The analytical perspectives will be contextualized within a broader theoretical discussion in philosophy and social sciences about the role of different factors that condition knowledge, which will also include an empirical approximation in the analysis of GMO and continental-drift controversies. Ultimately, the debate with rationalism is situated in a broader context about the ways of explaining the social acceptance of a theory, arguing that the problem with the rationalism that confuses a purely logical explanation with a sociological one is that it tends to judge rather than understand. (shrink)

The article appearing previously in this journal entitled “Styles of Thought on the Continental Drift Debate” (Pellegrini 2019) prompted a response from Weber and Šešelja (2020) which they termed as “a defence of rationalist accounts”. They argue that their self-designated “sophisticated rationalism” explains the closure of the continental-drift debate without being affected by my critiques to rationalist approaches. While ignoring the empirical evidence that shows the complexity of the debate and the necessity to include broader social elements in the analysis (...) (such as scientists denying continental drift even after the plate tectonics theory, others supporting it without being familiarized with the literature), they proclaim to be unconvinced about the analysis of the styles of thought. In order to clarify differences in the approach to the continental-drift historical controversy, I respond here to the criticism my paper drew while discussing the place of rationalism when explaining the acceptance of a theory. I will argue that their distinction between “crude” and “sophisticated” rationalism does not solve the problem of social aspects being left aside by rationalists in view of the acceptance of a theory. I will also argue that in order to understand what leads people to embrace a belief (namely scientists in accepting a theory), the analysis of mere cognitive or epistemic arguments is not enough and it leads to a reductionist explanation as to social behaviour. (shrink)