 In their (2018) Polger and Shapiro respond to these criticisms. They begin by clarifying what they call a common misconception of their view (and not just among these critics), that they don’t take seriously multiple realizability. They claim they do, but they insist that even these metaphysical concerns “are not immune from evidential demands” (2018: 448). The best evidence for multiple realizability would be widespread instances of multiple realization; but this, as they argued extensively in their (2016), is exactly what is lacking. Other kinds of evidence for multiple realizability include equipotentiality, evolutionary convergence, and computational explanations in the relevant sciences, but Polger and Shapiro insist that they have argued in their book that these kinds of evidence are lacking, too.