Before asking where it is we must first say what it is. This is the single major problem with the way EM theorists have approached the genuine question of whether extra-neural, extra-bodily material processes are a constitutive part of what we intuitively recognize as cognitive processes. Relying solely on those intuitions is the problem. (Di Paolo, 2009, p. 10).I've got to agree with the need for a mark of the cognitive.
Di Paolo, E. (2009). Extended life. Topoi, 28(1), 9-21.