Halliday & Matthiessen (1999: 595):
Since it is not taken over as a theory, the fundamental insights of the folk theory are ignored: figures of "Sensers sensing (that ...)" are re-construed through grammatical metaphor as participants. In particular, the domain of sensing is reified as the "mind", so that instead of somebody perceiving things happening, or somebody thinking that the moon was a balloon, the model of cognitive science has perception, vision, cognition, learning, memory, ... .