Greif sharpens the Extended Mind hypothesis by asking what kind of coupling can make an environmental entity constitutive of cognition rather than merely causally helpful. He adds historical depth to active externalism through an aetiological functionalism informed by niche construction, developmental systems theory and ecological psychology. The resulting account places natural environmental relations before familiar linguistic or technological extensions: external cognition is grounded in evolved forms of organism–environment integration from which artefactual couplings can later develop. The conceptual operation is to distinguish kinds of environmental participation instead of treating every useful external resource as part of the mind. This gives extended cognition a biological genealogy and prevents extension from becoming an indiscriminate metaphor. Greif bridges philosophy of mind and evolutionary theory by making function, history and environmental construction jointly relevant to cognitive constitution. His work is especially important for any account in which objects and places are not containers of thought but active components whose significance depends on patterned, historically established coupling.
