Wilson and Sperber--Relevance Theory(4)

When is an input relevant? Intuitively, an input (a sight, a sound, an utterance, a memory) is relevant to an individual when it connects with background information he has available to yield conclusions that matter to him: say, by answering a question he had in mind, improving his knowledge on a certain topic, settling a doubt, confirming a suspicion, or correcting a mistaken impression. In relevance-theoretic terms, an input is relevant to an individual when its processing in a context of available assumptions yields a POSITIVE COGNITIVE EFFECT. A positive cognitive effect is a worthwhile difference to the individual’s representation of the world – a true conclusion, for example. False conclusions are not worth having. They are cognitive effects, but not positive ones (Sperber & Wilson 1995: §3.1-2).3

The most important type of cognitive effect achieved by processing an input in a context is a CONTEXTUAL IMPLICATION, a conclusion deducible from the input and the context together, but from neither input nor context alone. For example, on seeing my train arriving, I might look at my watch, access my knowledge of the train timetable, and derive the contextual implication that my train is late (which may itself achieve relevance by combining with further contextual assumptions to yield further implications). Other types of cognitive effect include the strengthening, revision or abandonment of available assumptions. For example, the sight of my train arriving late The notion of a POSITIVE COGNITIVE EFFECT is needed to distinguish between information that merely SEEMS to the individual to be relevant and information that actually IS relevant. We are all aware that some of our beliefs may be false (even if we cannot tell which they are), and would prefer not to waste our effort drawing false conclusions. An efficient cognitive system is one which tends to pick out genuinely relevant inputs, yielding genuinely true conclusions. For discussion, see Sperber & Wilson (1995): §3.1-2. 3

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