and the identity
decodes the exterior Token: the ‘body-doing’
by reference to the interior Value: the ‘senser-sensing’ realised in neurological system-&-process
The importance of these encoding/decoding relations will become evident when we come to the transition to protolanguage.
The grammar, of course, construes this type of doing, ‘in which inner events are externalised as bodily behaviour’ (Halliday & Matthiessen 1999: 514) as behavioural processes: ‘those that represent the outer manifestations of inner workings, the acting out of processes of consciousness and physiological states’ (Halliday & Matthiessen 2004: 171), and it construes them as being intermediate between mental and material processes (Halliday & Matthiessen 1999: 514; Halliday & Matthiessen 2004: 171), as in this topology of typically human processes adapted from Halliday & Matthiessen’s (2004: 251).