Sarah

…chimpanzee, a mature female called Sarah, was tested by David Premack and his colleagues on a series of analogical reasoning tasks. Sarah previously had been extensively trained in solving matching-to-sample discriminations, to the point where she could use two plastic tokens, one meaning same, which she would place between any…

Sarah, the chimpanzee trained by Premack to use plastic tokens as words, also apparently learned to use tokens for nouns, verbs (give, take, put), adjectives (red, round, large), and prepositions (in, under). But do these signs or tokens really function as words? Does the ape…