Are Pseudosciences Like Seagulls? A Discriminant Metacriterion Facilitates the Solution of the Demarcation Problem

ABSTRACT In this article, I develop a philosophical framework, or ‘metacriterion’, for the demarcation of pseudoscience. Firstly, ‘gradualist demarcation’ is discussed in depth, considering an approach to the demarcation problem that presupposes the existence of a spectrum between science and pseudoscience; six general problems are found by means of this analysis. Secondly, based on the subsequent discussion of these problems, a discriminant metacriterion composed of four philosophical requirements is proposed. Lastly, it is shown that this metacriterion is able to guide the development of a workable and well-founded demarcation criterion for pseudoscience.