Thinking Intuitively

Abstract

Intuitive knowledge of the world involves knowing what kinds of things have which properties. We express this knowledge in generalities, such as “Ducks lay eggs.” Intuitive knowledge contrasts with extensional knowledge about actual entities in the world, which we express in quantified statements, such as “All U.S. presidents are male.” Reasoning based on this intuitive knowledge, while highly fluent and plausible, may in fact lead us into logical fallacy. Several lines of research have pointed to conceptual memory as the source of such logical failure. We represent concepts with prototypical properties, rather than with logical definitions, and we judge likelihood and argument strength on the basis of similarity between these prototypes instead of using correct notions of probability or logical inference. Evidence that our minds represent the world in this intuitive way can be seen in a range of phenomena, including people’s interpretations of logical connectives applied to everyday concepts, the effects of creativity and emergent features in conceptual combination, and the logically inconsistent beliefs that people express in their everyday language.