Artiicial Intelligence and Metaphors of Mind: Within-vehicle Reasoning and Its Beneets*

We de ne within-vehicle and within-tenor reasoning to be reasoning that is done on-they within the vehicle domain or tenor domain, respectively, of a conceptual metaphor, during the comprehension of utterances that manifest the metaphor. The main claim of this paper is that, at least in Arti cial Intelligence systems for understanding metaphorical discourse, within-vehicle reasoning is often bene cial. Indeed, in several important respects it is to be preferred over within-tenor reasoning that would achieve the same overall e ect; and in any case for certain types of metaphorical sentence there is useful within-vehicle reasoning that can be done but for which there is no feasible within-tenor parallel. Although some work on metaphor involves within-vehicle reasoning, its bene ts do not appear to have been explained and argued. The examples in the present paper focus on metaphors for the particular domain of mental states and processes; also, the examples involve only metaphors that are already familiar to the understander. However, these restrictions are not essential to the arguments. 2