Abstract
A popular interpretation of linguistic theories has it that they should describe the brain at a high level of abstraction. One way this has been understood is as the requirement that the theory’s derivational structure reflect (by being isomorphic to) relevant structural properties of the language user’s brain. An important criticisrn of this idea, made originally by Crispin Wright against Gareth Evans in the 1980s, still has purchase, notwithstanding attempts to reply to it, notably by Martin Davies and, indirectly, Christopher Peacocke. Wright’s objection seems to have been forgotten rather than seen off.