Grice and Heidegger on the Logic of Conversation.

What justifies one interlocutor to challenge the conversational expectations of the other? Paul Grice approaches conversation as one instance of joint action that, like all such action, is governed by the Cooperative Principle. He thinks the expectations of the interlocutors must align, although he acknowledges that expectations can and do shift in the course of a conversation through a process he finds strange. Martin Heidegger analyzes discourse as governed by the normativity of care for self and for another. It is the structure of care that warrants disrupting the presumed cooperative horizon of a conversation in order to occasion some new insight. The chapter expands Heidegger’s ontological conception of care to make sense of the exigencies of conversation. Conversation requires taking cognizance of (1) the human good, (2) the specifics of the conversational context, and (3) one’s responsibilities for the other. This threefold understanding can provide directives for subverting the interlocutor’s expectation for the purposes of a given conversation.