Productivity: Use of Concepts to Generate New Instances of Themselves
After Sarah learned "name of," the instruction "X name of Y" was an effective way in which to introduce new names. Henceforth, X, a previously unused piece of plastic, became the name of Y, a previously unnamed object. Sarah produced such sentences as "Give X Sarah" and comprehended such others as "Sarah insert X dish," showing in this way and others that she knew the meaning of X. So used, the word name 01 served to generate new names, and so new instances of itself.