From a Darwinian perspective, language is rooted in our neurobiology, and the process whereby interpretation is reached - in the case of argumentative sequences - is not dissimilar to that underlying action selection in response to environmental change: indeed, it arguably involves the same type of decision-making (Damasio 1994). Context construction, as construed by Nyan, corresponds to the preliminary stage of decision-making, when the changed environment needs to be categorised. What discourse markers contribute to context construction is an upgraded level of automation, whereby the degree...