Halliday & Matthiessen (1999: 601):
Both of these paths leading beyond the figures of sensing embodied in the folk model, beyond the ideational domain of sensing, are of fundamental importance to our conception of the individual mind and hence of the domain of cognitive science. By implication, cognitive science should not only be 'cognitive', it should also be semiotic, because it is the notion of meaning that enables us to see the connection between sensing and saying, and between theory and enactment of consciousness.
The folk model — developed unconsciously and collectively out of shared experience over hundreds of generations — construes and enacts the complexity of being a person by bringing to it a multiplicity of perspectives. It extends the 'mind' by refracting it through language, the resource that makes the "cognitive operations" possible and by the same token ensures that they are not subjective but intersubjective.