 Anderson divides revisionary projects for psychology into three kinds, based on the degree of revision each kind recommends for psychology, and the extent of one-to-one function-to-structure mappings the proposed revisions predicts will be available. “Conservatives” foresee little need for extensive revisions of psychology’s basic taxonomy, even as more neuroscientific evidence is taken into account than current standard practices pursue. “Moderates” insist that our knowledge of brain function “can (and should) act as one arbiter of the psychologically real” (2015: 70), principally by “splitting” or “merging” psychological concepts that currently are in use. “Radicals” project even more drastic revisions, even to the most primitive concepts of psychology, and even after such revisions they still do not expect that many one-to-one mappings between brain regions and the new psychological primitives will be found. Although Anderson does not stress this connection (eliminative materialism has not been a prominent concern in philosophy of mind or neuroscience for two decades), readers will notice similar themes discussed in  section 2  above, only now with scientific, not folk psychology the target of the radical revisionists. A key criterion for any satisfactory reformulation of a cognitive ontology is the degree to which it supports two kinds of inferences: “forward inferences”, from the engagement of a specific cognitive function to the prediction of brain activity; and “reverse inferences”, from the observation that a specific brain region or pattern occurs to the prediction that a specific cognitive operation is engaged. In light of this explicit criterion, Anderson usefully surveys the work of a number of prominent psychologists and cognitive neuroscientists in each of his revisionist groups. Given his broader commitment to neural reuse, and the trek it invites into “evolutionarily-inspired, ecological, and enactive terms”, Anderson’s own sentiments lie with the “radicals”: 