In this chapter, we propose a proto-discursive model of the origin of language.At the foundation of this model there is the idea that the origin of language is founded on discursive global coherence.Discourse coherence, in effect, is an essential property of human communication that, contrary to Sperber and Wilson (1986), is not reducible to their relevance principle.In support of our proposal, we demonstrate that the processing of discourse coherence implies different cognitive systems than those involved in the processing of relevance.Specifically, we suggest that to account for the ability to produce and comprehend discourse, it is necessary to refer to systems of spatial and temporal navigation, beyond the mindreading mechanism.From these considerations, it follows that Relevance Theory must be extended both on the level of properties and on the level of cognitive systems.