Activation of stance by cues, or attunement to the invariants in a populated environment?

While I agree with the distinction between <i>expedient</i> and <i>proper</i> ways of action, I find Jagiello et al.'s account of "stance switching" debatable. Fundamental to theories of cultural evolution is the fact that the shared environment is indefinitely rich, in which individuals are provided with opportunities for learning to tune themselves to specific affordances that are relevant to emerging situations.