Recent research indicates that early in life humans and chimpanzees have perceptual and Language-training, or prior experience with cognitive precursors for the development of arbitrarysymbolsfortheabstractconcepts"same higher level analogical information process- and different", appears to be necessary before ing abilities that are not shared by adult or in- chimpanzee or child can judge different pairs of fant macaque monkeys (Thompson, 1995; Th- objects or patterns to be analogically the same. ompson & Oden, 1996). Furthermore, some Comparable training with symbols for "same and form of re-coding via language or analogous different", however, does not enable macaque symbolic