It's at this stage perhaps that the conscious, self-regulating goal-directed self, with explicit motives, can begin to peel away from the 'pre-conscious' implicit, goal-directed self, with implicit motives. The former may be left-hemisphere lateralised.
Implicit motive driven cognition may be closer to pre-verbal, primate-typical, intentional cognition, with gesturing/body language-type communication and an action-based abstract 'ontology'. With human sophistication, the grain of communication and action may be finer, fast-acting and efficient.
Explicit motive systems may be built on top of this - involving the DLPFC and anterior cingulate (?) and new motivational systems.
This may also be related to the notion of 'access consciousness' in the sense of higher level, intelligent, rational, rule-based, action/cognition that is less anchored in (and confined to) particular implicit motives and associated ecological contexts (e.g. competition for food in chimpanzees), but is more general purpose.
Language is no doubt essential to this, being a hierarchical, recursive, goal-based, representational format that is not domain specific.
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