... because thattrait is adaptive – and that is why we can describe the heart16Two important developments of this idea are to be found in Ruth Garrett Milli-kan, Language, Thought and Other Biological ... previous chap-ter. For more on functions in this sense – or ‘proper functions’, as Millikan callsthem – see Millikan, Language, Thought and Other Biological Categories, ch. 1. An introduction ... numerous kite-flying children who constantlytriggered the monkeys’ calling-and-hiding behaviour, thatbehaviour would soon cease to be adaptive because the mon-keys would waste time and energy...