According to the view known variously as the extended mind (Clark & Chalmers 1998), vehicle externalism (Hurley 1998; Rowlands 2003, 2006) active externalism (Clark and Chalmers 1998), locational externalism (Wilson 2004) and environmentalism (Rowlands 1999), at least some token mental processes extend into the cognizing organism’s environment in that they are composed, partly (and, on most versions, contingently), of manipulative, exploitative, and transformative operations performed by that subject on suitable environmental structures. More precisely, what I shall refer to as the thesis of the extended mind (EM) is constituted by the following claims: